Amaral, L.; Pera, M. P. On the existence of periodic solutions in the resonance case. (Italian) Zbl 0616.34036 Recent methods in nonlinear analysis and applications, SAFA 4 - Int. Meet., Napoli/Italy 1980, 323-324 (1981). MSC: 34C25 PDF BibTeX XML OpenURL
Kannan, R.; Lakshmikantham, V. Periodic solutions of nonlinear boundary value problems. (English) Zbl 0608.34020 Recent methods in nonlinear analysis and applications, SAFA 4 - Int. Meet., Napoli/Italy 1980, 99-127 (1981). MSC: 34B15 34A34 PDF BibTeX XML OpenURL
Kapitanova, M.; Pet”rchev, N. Periodical fluctuations in a special case of quasilinear autonomous systems of second order differential equations by a semi-even nonlinearity. (Bulgarian. English, Russian summaries) Zbl 0595.34047 Nauchni Tr., Plovdivski Univ. 19, No. 1, 153-167 (1981). MSC: 34C25 PDF BibTeX XML Cite \textit{M. Kapitanova} and \textit{N. Pet''rchev}, Nauchni Tr., Plovdivski Univ. 19, No. 1, 153--167 (1981; Zbl 0595.34047) OpenURL
Vasil’eva, V. N. The finite element method in an identification problem. (Russian) Zbl 0592.65051 Discrete and distributed systems. (Differential and integral equations and their applications), Collect. Artic., Irkutsk 1981, 34-40 (1981). MSC: 65L10 65L60 34B05 34A55 PDF BibTeX XML OpenURL
Elnaggar, A. M.; Ahmed, I. Nonlinear oscillations of physical system described by the nonlinear differential equation \({\ddot \theta}+\omega ^ 2\,\sin \,\theta =F(\theta,{\dot \theta})\). (English) Zbl 0584.34029 Bull. Fac. Sci., Sect. A, Assiut Univ. 10, No. 2, 225-235 (1981). Reviewer: A.Osborne MSC: 34C15 34A34 PDF BibTeX XML OpenURL
Bojko, A. G. On a representation of the solution of a second order linear ordinary differential equation with variable coefficients. (Russian) Zbl 0581.34003 Qualitative theory of optimal systems with continuous-discrete parameters, Collect. sci. Works, Kiev 1981, 74-83 (1981). Reviewer: M.Gregus MSC: 34A05 34A30 PDF BibTeX XML OpenURL
Kyazimov, T. G. On the solution of two problems for the Lavrent’ev-Bitsadze equation. (English) Zbl 0549.35095 Sov. Math. 25, No. 10, 47-53 (1981). MSC: 35M99 35B50 35A05 35J25 65N12 PDF BibTeX XML Cite \textit{T. G. Kyazimov}, Sov. Math. 25, No. 10, 47--53 (1981; Zbl 0549.35095) OpenURL
Yakovleva, E. A. The average over two small parameters of an elliptic equation with rapidly oscillating coefficients. (English) Zbl 0548.35017 U.S.S.R. Comput. Math. Math. Phys. 21, No. 4, 225-232 (1981). MSC: 35C20 35J15 34C29 PDF BibTeX XML Cite \textit{E. A. Yakovleva}, U.S.S.R. Comput. Math. Math. Phys. 21, No. 4, 225--232 (1981; Zbl 0548.35017) Full Text: DOI OpenURL
Bitay, L. Nomogramme pour la solution d’une équation différentielle linéaire du second ordre. (Romanian. French summary) Zbl 0545.65095 Bul. Ştiinţ. Inst. Politeh. Cluj-Napoca, Ser. Electroteh. Energ. Inf. 24, 21-24 (1981). MSC: 65S05 34A30 PDF BibTeX XML Cite \textit{L. Bitay}, Bul. Științ. Inst. Politeh. Cluj-Napoca, Ser. Electroteh. Energ. Inf. 24, 21--24 (1981; Zbl 0545.65095) OpenURL
Bezhanishvili, D. A. Cauchy problem for a quasilinear equation. (English) Zbl 0543.35068 Differ. Equations 17, 11-15 (1981). MSC: 35L80 35A05 35L70 47J05 PDF BibTeX XML Cite \textit{D. A. Bezhanishvili}, Differ. Equations 17, 11--15 (1981; Zbl 0543.35068) OpenURL
Agoshkov, V. I.; Shutyaev, V. P. Projection-difference method for the solution of the transport equation in a spherical-symmetric domain. (Russian) Zbl 0537.65097 Variational-difference methods in mathematical physics, IV. All-Union Conf. 1980, Novosibirsk 1981, 4-15 (1981). Reviewer: A.Galántai MSC: 65R20 45K05 82C70 PDF BibTeX XML OpenURL
Kozlov, S. D. Classification of second order ordinary differential equations. (Russian) Zbl 0535.34007 Geometry of incidence structures and differential equations, Collect. sci. Artic., Smolensk 1981, 40-46 (1981). Reviewer: M.Greguš MSC: 34A34 PDF BibTeX XML OpenURL
Müller, Gisela Eine Anwendung der Theorie der Cosinusfamilien auf Randwertaufgaben für Differentialgleichungen 2. Ordnung in Banachräumen. (German) Zbl 0531.34045 Mathematisch-Naturwissenschaftliche Fakultät der Rheinisch-Westfälischen Technischen Hochschule Aachen. 131 S. (1981). Reviewer: H.Martin MSC: 34G20 34B15 45J05 PDF BibTeX XML OpenURL
Nikolenko, V. N. Equations of mathematical physics. Textbook. (Uravneniya matematicheskoj fiziki. Uchebnoe posobie). (Russian) Zbl 0529.35001 Moskva: Izdatel’stvo Moskovskogo Universiteta. 392 p. R. 0.55 (1981). MSC: 35-01 35J05 35K05 35L05 35J25 35C05 35C15 PDF BibTeX XML OpenURL
Eltayeb, I. A.; Hassan, M. H. A. On the nonlinear evolution of sand dunes. (English) Zbl 0526.73100 Geophys. J. R. Astron. Soc. 65, 31-45 (1981). MSC: 74L10 35B35 PDF BibTeX XML Cite \textit{I. A. Eltayeb} and \textit{M. H. A. Hassan}, Geophys. J. R. Astron. Soc. 65, 31--45 (1981; Zbl 0526.73100) OpenURL
Fornberg, Bengt Numerical computation of nonlinear waves. (English) Zbl 0525.65074 Nonlinear phenomena in physics and biology, Proc. NATO Adv. Study Inst., Banff, Alberta/Can. 1980, NATO Adv. Study Inst. Ser. B, Phys., Vol. 75, 157-184 (1981). MSC: 65N22 35L70 35Q99 35J65 76B15 PDF BibTeX XML OpenURL
Bakaev, N. Yu. Operator semigroups and differential equations in Banach space. (English. Russian original) Zbl 0525.47027 Sov. Math., Dokl. 23, 535-539 (1981); translation from Dokl. Akad. Nauk SSSR 258, 521-525 (1981). MSC: 47D03 47E05 34G10 PDF BibTeX XML Cite \textit{N. Yu. Bakaev}, Sov. Math., Dokl. 23, 535--539 (1981; Zbl 0525.47027); translation from Dokl. Akad. Nauk SSSR 258, 521--525 (1981) OpenURL
Chou, Huanwen A perturbation method for nonlinear wave equations. (Chinese) Zbl 0523.35077 Wuhandaxue Xuebao 1981, Special Issue, 44-52 (1981). MSC: 35L70 35B20 34B30 35A05 PDF BibTeX XML OpenURL
Erbe, L. Comparison theorems for linear differential equations. (English) Zbl 0521.34041 Qualitative theory of differential equations, Vol. I, Szeged 1979, Colloq. Math. Soc. János Bolyai 30, 193-204 (1981). MSC: 34C11 PDF BibTeX XML OpenURL
Wright, C. J. On the numerical solution of delay differential equations. (English) Zbl 0519.65051 Numerical mathematics, Proc. 7th South Afr. Symp., Durban 1981, 61-77 (1981). MSC: 65L05 65N40 34K05 35R10 35K20 PDF BibTeX XML OpenURL
Samarskij, A. A. Some problems in differential equation theory. (English. Russian original) Zbl 0519.35069 Differ. Equations 16, 1221-1228 (1981); translation from Differ. Uravn. 16, 1925-1935 (1980). MSC: 35Q99 35K20 35J25 35A05 82B05 PDF BibTeX XML Cite \textit{A. A. Samarskij}, Differ. Equations 16, 1221--1228 (1981; Zbl 0519.35069); translation from Differ. Uravn. 16, 1925--1935 (1980) OpenURL
Di Blasio, Gabriella The linear-quadratic optimal control problem for delay differential equations. (English) Zbl 0518.49002 Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 71, 156-161 (1981). MSC: 49J20 35R10 47D03 35K10 49J27 PDF BibTeX XML Cite \textit{G. Di Blasio}, Atti Accad. Naz. Lincei, VIII. Ser., Rend., Cl. Sci. Fis. Mat. Nat. 71, 156--161 (1981; Zbl 0518.49002) OpenURL
Privovarov, Ivan Influence of addition of nonlinearities on the behavior of autonomous system phase trajectories. (Russian) Zbl 0515.34007 Zagadnienia Drgań Nieliniow. 20, 53-64 (1981). MSC: 34A25 34A34 PDF BibTeX XML Cite \textit{I. Privovarov}, Zag. Drgań Nieliniowych 20, 53--64 (1981; Zbl 0515.34007) OpenURL
Smirnov, M. M. Boundary problem of the Bitsadze-Samarskij type for a mixed type second order differential equation with two degeneration lines. (Russian) Zbl 0514.35059 Correct boundary value problems for non-classical equations of mathematical physics, Collect. sci. Works, Novosibirsk 1981, 170-175 (1981). MSC: 35M99 35A05 PDF BibTeX XML OpenURL
Krumin’, L. E. The TE\(_{\alpha}\)-problem for a mixed type equation with a modified Karol-Tricomi operator in the case of an infinite domain. (Russian) Zbl 0514.35057 Correct boundary value problems for non-classical equations of mathematical physics, Collect. sci. Works, Novosibirsk 1981, 114-116 (1981). MSC: 35M99 35A05 35B35 PDF BibTeX XML OpenURL
Isaeva, N. M. On the Dirichlet problem for an elliptic-hyperbolic equation system. (Russian) Zbl 0514.35055 Correct boundary value problems for non-classical equations of mathematical physics, Collect. sci. Works, Novosibirsk 1981, 71-74 (1981). MSC: 35M99 35A05 35B35 PDF BibTeX XML OpenURL
Oshorov, B. B. On certain compound type systems. (Russian) Zbl 0514.35016 Correct boundary value problems for non-classical equations of mathematical physics, Collect. sci. Works, Novosibirsk 1981, 159-162 (1981). MSC: 35G05 35A05 35B10 PDF BibTeX XML OpenURL
Kopaneva, V. I. A boundary value problem for a second order differential equation in a Hilbert space. (Russian) Zbl 0514.34050 Linear operators in functional spaces, Work Collect., Voronezh 1981, 57-63 (1981). MSC: 34G10 34B99 PDF BibTeX XML OpenURL
Alymkulov, K. The solution of perturbed systems of differential equations with a regular singular point. (Russian) Zbl 0512.34043 Issled. Integro-Differ. Uravn. 14, 270-275 (1981). MSC: 34E10 PDF BibTeX XML OpenURL
Cattaneo, C. Elementi di teoria della propagazione ondosa. Lezioni raccolte da S. Pluchino. (Italian) Zbl 0511.73027 Quaderni dell-Unione Matematica Italiana, 20. Bologna: Pitagora Editrice. I, 216 p. (1981). MSC: 74J99 74-02 35L67 58J45 35L65 35A30 76N99 74S30 PDF BibTeX XML OpenURL
Karchevskij, M. M.; Lapin, A. V. Some questions of the theory of the finite element method. Textbook. (Nekotorye voprosy teorii metoda konechnykh ehlementov. Uchebnoe posobie). (Russian) Zbl 0511.65077 Kazan’: Izdatel’stvo Kazanskogo Universiteta. 112 p. R. 0.17 (1981). MSC: 65N30 65L60 65-01 35J25 65D32 34B05 35J05 PDF BibTeX XML OpenURL
Bykov, Ya. V.; Daakybaev, B. On periodic solutions of differential equations of second order. (Russian) Zbl 0511.34030 Issled. Integro-Differ. Uravn. 14, 44-54 (1981). MSC: 34C25 34A34 PDF BibTeX XML OpenURL
Elbert, A. A half-linear second order differential equation. (English) Zbl 0511.34006 Qualitative theory of differential equations, Vol. I, Szeged 1979, Colloq. Math. Soc. János Bolyai 30, 153-180 (1981). MSC: 34A12 34L99 34C10 34A34 PDF BibTeX XML OpenURL
Bykov, Ya. V. On the self-excited oscillations of an autonomous differential equation of second order. (Russian) Zbl 0509.34044 Issled. Integro-Differ. Uravn. 14, 24-43 (1981). MSC: 34C25 34C15 34A34 PDF BibTeX XML OpenURL
Bojadziev, G.; Edwards, J. On some asymptotic methods for non-oscillatory and oscillatory processes. (English) Zbl 0509.34031 Zagadnienia Drgań Nieliniow. 20, 69-79 (1981). MSC: 34C10 34E05 34A34 PDF BibTeX XML Cite \textit{G. Bojadziev} and \textit{J. Edwards}, Zag. Drgań Nieliniowych 20, 69--79 (1981; Zbl 0509.34031) OpenURL
Malysheva, I. A. Boundedness and convergence of the solutions of second-order differential equations. (English. Russian original) Zbl 0507.34030 Sov. Math. 25, No. 7, 59-69 (1981); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No. 7(230), 54-61 (1981). MSC: 34C11 PDF BibTeX XML Cite \textit{I. A. Malysheva}, Sov. Math. 25, No. 7, 59--69 (1981; Zbl 0507.34030); translation from Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No. 7(230), 54--61 (1981) OpenURL
Emirsajlow, Z. On some optimal control problems for systems described by a generalized hyperbolic equation. (Polish) Zbl 0506.49002 Arch. Autom. Telemech. 26, 333-347 (1981). MSC: 49J20 35L15 49J27 42B05 93C20 PDF BibTeX XML Cite \textit{Z. Emirsajlow}, Arch. Autom. Telemech. 26, 333--347 (1981; Zbl 0506.49002) OpenURL
Fushchich, V. I. Symmetry in problems of mathematical physics. (Russian) Zbl 0505.35016 Algebraic-theoretical investigations in mathematical physics, Collect. sci. Works, Kiev 1981, 6-28 (1981). MSC: 35C05 35Q99 35B20 35L70 70H20 PDF BibTeX XML OpenURL
Kwong, Man Kam On Lyapunov’s inequality for disfocality. (English) Zbl 0504.34020 J. Math. Anal. Appl. 83, 486-494 (1981). MSC: 34C10 34D20 34A30 PDF BibTeX XML Cite \textit{M. K. Kwong}, J. Math. Anal. Appl. 83, 486--494 (1981; Zbl 0504.34020) Full Text: DOI OpenURL
Teut, O. M. A problem for a system of mixed-composite type in a characteristic quadrangle. (English) Zbl 0503.35063 Sov. Math. 25, No. 9, 106-110 (1981). MSC: 35M99 35L20 PDF BibTeX XML Cite \textit{O. M. Teut}, Sov. Math. 25, No. 9, 106--110 (1981; Zbl 0503.35063) OpenURL
Ames, W. F.; Lohner, R. J.; Adams, E. Group properties of u//(tt)=[f(u)u//x]//x. (English) Zbl 0503.35058 Int. J. Non-Linear Mech. 16, 439-447 (1981). MSC: 35L70 35A30 22E99 35Q99 76N15 PDF BibTeX XML Cite \textit{W. F. Ames} et al., Int. J. Non-Linear Mech. 16, 439--447 (1981; Zbl 0503.35058) Full Text: DOI OpenURL
Chabrowski, Jan; Thompson, B. On the behaviour near the boundary of solutions of a semi-linear partial differential equation of elliptic type. (English) Zbl 0502.35044 J. Aust. Math. Soc., Ser. A 31, 405-414 (1981). MSC: 35J65 35D10 35J67 35J25 46E35 PDF BibTeX XML Cite \textit{J. Chabrowski} and \textit{B. Thompson}, J. Aust. Math. Soc., Ser. A 31, 405--414 (1981; Zbl 0502.35044) OpenURL
Rinke, Bernd; Wuensch, Volkmar Zum Huygensschen Prinzip bei der skalaren Wellengleichung. (German) Zbl 0501.53010 Beitr. Anal. 18, 43-75 (1981). MSC: 53B21 53B50 35L20 PDF BibTeX XML Cite \textit{B. Rinke} and \textit{V. Wuensch}, Beitr. Anal. 18, 43--75 (1981; Zbl 0501.53010) OpenURL
Clements, David L. Boundary value problems governed by second order elliptic systems. (English) Zbl 0499.35004 Monographs and Studies in Mathematics, 12. Boston - London -Melbourne: Pitman Advanced Publishing Program. VIII, 162 p. £21.00 (1981). MSC: 35-01 35J45 35J15 35A22 35A25 74B99 74H99 80A10 PDF BibTeX XML OpenURL
Onose, Hiroshi Nonlinear oscillation of functional differential equations with deviating argument. (English) Zbl 0499.34047 Qualitative theory of solutions in functional differential equations, Proc. Symp., Kyoto 1981, RIMS Kokyuroku 432, 1-12 (1981). MSC: 34K99 34C15 PDF BibTeX XML OpenURL
Sueli, Endre E. On the convergence of the Tikhonov-Samarskij difference scheme. (Serbo-Croat) Zbl 0498.65042 Mat. Vesn. 5(18)(33), 315-325 (1981). MSC: 65L10 65L50 34B05 PDF BibTeX XML Cite \textit{E. E. Sueli}, Mat. Vesn. 5(18)(33), 315--325 (1981; Zbl 0498.65042) OpenURL
Raspopova, N. S. Quasi-transformation method for a second-order equation in Banach space. (English) Zbl 0498.34048 Sov. Math. 25, No. 11, 42-47 (1981). MSC: 34G20 35G10 35K25 35R20 47J25 PDF BibTeX XML Cite \textit{N. S. Raspopova}, Sov. Math. 25, No. 11, 42--47 (1981; Zbl 0498.34048) OpenURL
Huang, Yongnian; Zhou, Peiyuan On the solutions of Navier-Stokes equations and the theory of homogeneous isotropic turbulence. (English) Zbl 0497.76060 Sci. Sin. 24, 1207-1230 (1981). MSC: 76F05 76D05 76F10 76F99 45K05 PDF BibTeX XML Cite \textit{Y. Huang} and \textit{P. Zhou}, Sci. Sin. 24, 1207--1230 (1981; Zbl 0497.76060) OpenURL
Omey, E. Regular variation and its applications to second order linear differential equations. (English) Zbl 0497.34013 Bull. Soc. Math. Belg., Sér. B 33, 207-229 (1981). MSC: 34A30 47E05 PDF BibTeX XML Cite \textit{E. Omey}, Bull. Soc. Math. Belg., Sér. B 33, 207--229 (1981; Zbl 0497.34013) OpenURL
Luthar, R. S. General solution of a general second-order linear differential equation. (English) Zbl 0497.34009 Pi Mu Epsilon J. 7, 303-306 (1981). MSC: 34A12 34A30 PDF BibTeX XML Cite \textit{R. S. Luthar}, Pi Mu Epsilon J. 7, 303--306 (1981; Zbl 0497.34009) OpenURL
Heynig, Frank Eine Methode zur Anwendung der FEM auf instationäre Aufgaben. (German) Zbl 0496.65058 Wiss. Z. Tech. Hochsch. Karl-Marx-Stadt 23, 405-418 (1981). MSC: 65N30 44A40 35K20 35L20 PDF BibTeX XML Cite \textit{F. Heynig}, Wiss. Z. Tech. Hochsch. Karl-Marx-Stadt 23, 405--418 (1981; Zbl 0496.65058) OpenURL
Liang, Zhongchao The asymptotic behavior of solutions of certain nonlinear differential equations of the second order. (Chinese) Zbl 0494.34032 Acta Math. Sin. 24, 45-54 (1981). MSC: 34D05 34E05 34A34 34C11 PDF BibTeX XML Cite \textit{Z. Liang}, Acta Math. Sin. 24, 45--54 (1981; Zbl 0494.34032) OpenURL
Strekolovskij, A. S. On the optimality of systems, described by a parabolic equation according to the vector criterion. (Russian) Zbl 0492.49009 Chislennye Metody Optimizatsii i ikh Prilozheniya, Prikl. Mat. 11, 86-97 (1981). MSC: 49K20 35K10 93C20 PDF BibTeX XML OpenURL
Berestycki, Henri; Cazenave, Thierry Instabilité des etats stationnaires dans les équations de Schrödinger et de Klein-Gordon non linéaires. (French) Zbl 0492.35010 C. R. Acad. Sci., Paris, Sér. I 293, 489-492 (1981). MSC: 35B35 35L70 35J10 35Q99 PDF BibTeX XML Cite \textit{H. Berestycki} and \textit{T. Cazenave}, C. R. Acad. Sci., Paris, Sér. I 293, 489--492 (1981; Zbl 0492.35010) OpenURL
Kenig, K. Eh.; Korostelev, A. P. Bottlenecks in distributed systems with random disturbances. II: Concentrated disturbances. (English. Russian original) Zbl 0491.93070 Autom. Remote Control 42, 1497-1502 (1982); translation from Avtom. Telemekh. 1981, No. 11, 83-89 (1981). MSC: 93E25 60H15 35K10 PDF BibTeX XML Cite \textit{K. Eh. Kenig} and \textit{A. P. Korostelev}, Autom. Remote Control 42, 1497--1502 (1981; Zbl 0491.93070); translation from Avtom. Telemekh. 1981, No. 11, 83--89 (1981) OpenURL
Pinto, J. S.; Wood, A. D. On the asymptotic behaviour of the Titchmarsh-Weyl coefficients for a fourth order equation. (English) Zbl 0491.34008 Quaest. Math. 4, 337-345 (1981). MSC: 34M99 PDF BibTeX XML Cite \textit{J. S. Pinto} and \textit{A. D. Wood}, Quaest. Math. 4, 337--345 (1981; Zbl 0491.34008) Full Text: DOI OpenURL
Bershchanskij, Ya. M.; Meerov, M. V. Optimal control of systems described by an elliptic-type partial differential equation. (English. Russian original) Zbl 0489.93026 Autom. Remote Control 42, 1285-1290 (1982); translation from Avtom. Telemekh. 1981, No. 10, 5-11 (1981). MSC: 93C20 35J25 49J20 47J25 PDF BibTeX XML Cite \textit{Ya. M. Bershchanskij} and \textit{M. V. Meerov}, Autom. Remote Control 42, 1285--1290 (1981; Zbl 0489.93026); translation from Avtom. Telemekh. 1981, No. 10, 5--11 (1981) OpenURL
Sarlet, Willy; Bahar, Leon Y. Quadratic integrals for linear nonconservative systems and their connection with the inverse problem of Lagrangian dynamics. (English) Zbl 0489.70006 Int. J. Non-Linear Mech. 16, 271-281 (1981). MSC: 70Fxx 70K99 37J99 70F10 PDF BibTeX XML Cite \textit{W. Sarlet} and \textit{L. Y. Bahar}, Int. J. Non-Linear Mech. 16, 271--281 (1981; Zbl 0489.70006) Full Text: DOI OpenURL
de Bivar-Weinholtz, Antonio Formule de la demi-somme pour des opérateurs du type Schrödinger avec potentiel singulier complexe. (French) Zbl 0489.35084 Rend. Sem. Mat., Torino 39, No. 1, 137-160 (1981). MSC: 35S99 35J15 47D03 35J10 PDF BibTeX XML Cite \textit{A. de Bivar-Weinholtz}, Rend. Semin. Mat., Torino 39, No. 1, 137--160 (1981; Zbl 0489.35084) OpenURL
Nosirov, F. U. To the question on the influence of delay in equations with gyroscopic terms. (Russian) Zbl 0489.34081 Ukr. Mat. Zh. 33, 824-828 (1981). MSC: 34K25 34E05 34A45 PDF BibTeX XML Cite \textit{F. U. Nosirov}, Ukr. Mat. Zh. 33, 824--828 (1981; Zbl 0489.34081) OpenURL
Michalikova, Elena A note on a certain nonlinear differential equation of the second order. (Slovak) Zbl 0489.34028 Pr. Stud. Vys. Sk. Dopravnej Ziline, Ser. Mat.-Fyz. 4, 53-55 (1981). MSC: 34C05 34A34 PDF BibTeX XML Cite \textit{E. Michalikova}, Pr. Stud. Vys. Sk. Dopravnej Ziline, Ser. Mat.-Fyz. 4, 53--55 (1981; Zbl 0489.34028) OpenURL
Stepanets, N. I. On some estimates of certainty for the solution of boundary value problems for ordinary differential equations. (Russian) Zbl 0489.34014 Applied programming methods, Collect. Artic., Kiev 1981, 85-92 (1981). MSC: 34B10 34B27 65L10 PDF BibTeX XML OpenURL
Nelson, Paul; Sagong, Seok; Elder, Ira T. Invariant imbedding applied to homogeneous two-point boundary-value problems with a singularity of the first kind. (English) Zbl 0488.65034 Appl. Math. Comput. 9, 93-110 (1981). MSC: 65L10 34B05 PDF BibTeX XML Cite \textit{P. Nelson} et al., Appl. Math. Comput. 9, 93--110 (1981; Zbl 0488.65034) Full Text: DOI OpenURL
Wong, James S. W. Remarks on nonoscillation theorems for a second order nonlinear differential equation. (English) Zbl 0488.34025 Proc. Am. Math. Soc. 83, 541-546 (1981). MSC: 34C15 34C10 34A34 PDF BibTeX XML Cite \textit{J. S. W. Wong}, Proc. Am. Math. Soc. 83, 541--546 (1981; Zbl 0488.34025) Full Text: DOI OpenURL
Wlodarczyk, E. General closed-form solutions of the equations of one-dimensional nonstationary isentropic motions of isotropic elastic media subject to finite deformations. (English) Zbl 0487.73042 Arch. Mech. 33, 73-81 (1981). MSC: 74B20 35C05 PDF BibTeX XML Cite \textit{E. Wlodarczyk}, Arch. Mech. 33, 73--81 (1981; Zbl 0487.73042) OpenURL
Zeman, Jiri Zur asymptotischen Integration der Differentialgleichung. \(y^ n\) + q(t)y = 0. (German) Zbl 0487.34062 Acta Univ. Palacki. Olomuc., Fac. Rerum Nat. 69, Math. 20, 129-132 (1981). MSC: 34E05 PDF BibTeX XML Cite \textit{J. Zeman}, Acta Univ. Palacki. Olomuc., Fac. Rerum Nat., Math. 20, 129--132 (1981; Zbl 0487.34062) Full Text: EuDML OpenURL
Reißig, Rolf Periodic solutions of a second order differential equation involving a symmetrical restoring term. (English) Zbl 0487.34035 Rend. Circ. Mat. Palermo (2) 30, 139-147 (1981). Reviewer: Rolf Reißig (Bochum) MSC: 34C25 PDF BibTeX XML Cite \textit{R. Reißig}, Rend. Circ. Mat. Palermo (2) 30, 139--147 (1981; Zbl 0487.34035) Full Text: DOI OpenURL
Zanolin, Fabio Periodic solutions for second order differential systems with damping. (English) Zbl 0487.34033 Rend. Sem. Mat. Univ. Padova 65, 224-234 (1981). MSC: 34C25 34C11 PDF BibTeX XML Cite \textit{F. Zanolin}, Rend. Semin. Mat. Univ. Padova 65, 224--234 (1981; Zbl 0487.34033) Full Text: Numdam EuDML OpenURL
Graef, John R.; Spikes, Paul W. The limit point - limit circle problem for nonlinear equations. (English) Zbl 0487.34026 Spectral theory of differential operators, Proc. Conf., Birmingham/USA 1981, North-Holland Math. Stud. 55, 207-210 (1981). MSC: 34C05 34C15 34C11 34A34 PDF BibTeX XML OpenURL
Eier, Richard; Lidl, Rudolf; Dunn, Ken B. Differential equations for generalized Chebyshev polynomials. (English) Zbl 0487.33009 Rend. Mat. Appl., VII. Ser. 1, 633-646 (1981). MSC: 33C45 30C10 PDF BibTeX XML Cite \textit{R. Eier} et al., Rend. Mat. Appl., VII. Ser. 1, 633--646 (1981; Zbl 0487.33009) OpenURL
Beregovenko, G. Ya.; Saukh, S. E. On the organization of parallel calculations for the solution nonlinear differential equations. (Russian) Zbl 0486.65046 Dokl. Akad. Nauk Ukr. SSR, Ser. A 1981, No. 9, 65-68 (1981). MSC: 65L05 68N25 PDF BibTeX XML Cite \textit{G. Ya. Beregovenko} and \textit{S. E. Saukh}, Dokl. Akad. Nauk Ukr. SSR, Ser. A 1981, No. 9, 65--68 (1981; Zbl 0486.65046) OpenURL
Hong, Jiaxing On boundary value problems for mixed equations with characteristic degenerate surfaces. (English) Zbl 0486.35055 Chin. Ann. Math. 2, 407-424 (1981). MSC: 35M99 35B65 35B45 PDF BibTeX XML Cite \textit{J. Hong}, Chin. Ann. Math. 2, 407--424 (1981; Zbl 0486.35055) OpenURL
Umarov, Kh. G. Riemann’s method for some hyperbolic equations with constant operator coefficients. (English. Russian original) Zbl 0486.35046 Sov. Math., Dokl. 24, 123-127 (1981); translation from Dokl. Akad. Nauk SSSR 259, 549-553 (1981). MSC: 35L20 35R20 35C15 35D05 35D10 35B30 35L35 35A05 PDF BibTeX XML Cite \textit{Kh. G. Umarov}, Sov. Math., Dokl. 24, 123--127 (1981; Zbl 0486.35046); translation from Dokl. Akad. Nauk SSSR 259, 549--553 (1981) OpenURL
Kuz’min, A. G. On the behaviour of the characteristics of equations of mixed type near the line of degeneration. (Russian) Zbl 0486.35005 Differ. Uravn. 17, 2052-2063 (1981). MSC: 35A30 35M99 PDF BibTeX XML Cite \textit{A. G. Kuz'min}, Differ. Uravn. 17, 2052--2063 (1981; Zbl 0486.35005) OpenURL
Hatvani, L. A generalization of the Barbashin-Krasovskij theorems to the partial stability in nonautonomous systems. (English) Zbl 0486.34044 Qualitative theory of differential equations, Vol. I, Szeged 1979, Colloq. Math. Soc. János Bolyai 30, 381-409 (1981). MSC: 34D20 70K20 PDF BibTeX XML OpenURL
Lezanski, T. Sur les équations du type: psi(x,h)=0. II. (French) Zbl 0485.47046 Stud. Math. 71, 37-68 (1981). MSC: 47J05 35J25 34B15 PDF BibTeX XML Cite \textit{T. Lezanski}, Stud. Math. 71, 37--68 (1981; Zbl 0485.47046) Full Text: DOI EuDML OpenURL
Cassell, J. S. The asymptotic behaviour of a class of linear oscillators. (English) Zbl 0485.34023 Q. J. Math., Oxf. II. Ser. 32, 287-302 (1981). MSC: 34C10 34A30 PDF BibTeX XML Cite \textit{J. S. Cassell}, Q. J. Math., Oxf. II. Ser. 32, 287--302 (1981; Zbl 0485.34023) Full Text: DOI OpenURL
Erugin, N. P.; Smirnov, M. M. Functionally invariant solutions of differential equations. (English) Zbl 0484.35023 Differ. Equations 17, 563-573 (1981). MSC: 35G05 35B40 35C15 PDF BibTeX XML Cite \textit{N. P. Erugin} and \textit{M. M. Smirnov}, Differ. Equations 17, 563--573 (1981; Zbl 0484.35023) OpenURL
Singh, P. N.; Awin, A. M.; Shouman, A. R. Exact solution of some nonlinear oscillation problems. (English) Zbl 0483.73055 J. Sound Vib. 75, 303-306 (1981). MSC: 74H45 34A34 PDF BibTeX XML Cite \textit{P. N. Singh} et al., J. Sound Vib. 75, 303--306 (1981; Zbl 0483.73055) Full Text: DOI OpenURL
Teut, O. M. A problem for a system of mixed-compound type in characteristic quadrangle. (Russian) Zbl 0483.35055 Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No. 9(232), 81-84 (1981). MSC: 35M99 35L20 PDF BibTeX XML Cite \textit{O. M. Teut}, Izv. Vyssh. Uchebn. Zaved., Mat. 1981, No. 9(232), 81--84 (1981; Zbl 0483.35055) OpenURL
Baxley, John V. Nonlinear two-point boundary value problems. (English) Zbl 0483.34017 Ordinary and partial differential equations, Proc. 6th Conf. Dundee 1980, Lect. Notes Math. 846, 46-54 (1981). MSC: 34B15 34B10 PDF BibTeX XML OpenURL
Nakonechnyj, A. G. Approximate minimax estimates for functionals of solutions of elliptic equations. (Russian) Zbl 0482.49006 Vychisl. Prikl. Mat., Kiev 45, 78-88 (1981). MSC: 49J35 49J20 35J15 PDF BibTeX XML Cite \textit{A. G. Nakonechnyj}, Vychisl. Prikl. Mat. 45, 78--88 (1981; Zbl 0482.49006) OpenURL
Sommer, Rolf Finite-Element-Approximation und semi-infinite Optimierungsaufgaben. (German) Zbl 0481.90055 Seminarber., Humboldt-Univ. Berlin, Sekt. Math. 39, 210-224 (1981). MSC: 90C05 65N06 90C34 90C90 PDF BibTeX XML Cite \textit{R. Sommer}, Seminarber., Humboldt-Univ. Berlin, Sekt. Math. 39, 210--224 (1981; Zbl 0481.90055) OpenURL
Rao, C. R. A. Epstein profiles and the Riemann p-functions. (English) Zbl 0481.73021 Wave Motion 3, 237-241 (1981). MSC: 74B99 33E15 33C60 74J99 74E05 34M99 PDF BibTeX XML Cite \textit{C. R. A. Rao}, Wave Motion 3, 237--241 (1981; Zbl 0481.73021) Full Text: DOI OpenURL
Voigt, Wolfgang Das Differenzenverfahren bei nichtlinearen parabolischen Differential- Funktional-Gleichungen mit Rand-Funktional-Bedingungen. (German) Zbl 0481.65053 Beitr. Anal. 18, 91-98 (1981). MSC: 65N12 35K20 PDF BibTeX XML Cite \textit{W. Voigt}, Beitr. Anal. 18, 91--98 (1981; Zbl 0481.65053) OpenURL
Moldabaev, S. M. On an optimization problem for an equation of parabolic type. (Russian) Zbl 0481.49010 Izv. Akad. Nauk Kaz. SSR, Ser. Fiz.-Mat. 1981, No. 5, 40-44 (1981). MSC: 49J20 49K20 35K10 35B37 PDF BibTeX XML Cite \textit{S. M. Moldabaev}, Izv. Akad. Nauk Kaz. SSR, Ser. Fiz.-Mat. 1981, No. 5, 40--44 (1981; Zbl 0481.49010) OpenURL
Bezhanishvili, D. A. The Cauchy problem for a certain quasilinear equation. (Russian) Zbl 0481.35063 Differ. Uravn. 17, 18-24 (1981). MSC: 35L80 35L70 47J05 35A05 PDF BibTeX XML Cite \textit{D. A. Bezhanishvili}, Differ. Uravn. 17, 18--24 (1981; Zbl 0481.35063) OpenURL
Holmes, C.; Holmes, P. Second order averaging and bifurcations to subharmonics in Duffing’s equation. (English) Zbl 0478.73028 J. Sound Vib. 78, 161-174 (1981). MSC: 74G60 34C29 74S30 34E10 74J99 PDF BibTeX XML Cite \textit{C. Holmes} and \textit{P. Holmes}, J. Sound Vib. 78, 161--174 (1981; Zbl 0478.73028) Full Text: DOI OpenURL
Meredov, M. Boundary-value problems for a system of multidimensional equations of mixed type. (English) Zbl 0478.35070 Differ. Equations 17, 588-593 (1981). MSC: 35M99 35J25 35L20 PDF BibTeX XML Cite \textit{M. Meredov}, Differ. Equations 17, 588--593 (1981; Zbl 0478.35070) OpenURL
Mitropol’skij, Yu. A.; Krivosheya, S. A. Asymptotic solution of a class of boundary-value problems. (English) Zbl 0478.35066 Ukr. Math. J. 32, 584-590 (1981). MSC: 35L70 35G30 35B40 35L20 35A35 PDF BibTeX XML Cite \textit{Yu. A. Mitropol'skij} and \textit{S. A. Krivosheya}, Ukr. Math. J. 32, 584--590 (1981; Zbl 0478.35066) Full Text: DOI OpenURL
Costa, David G.; Strauss, Walter A. Energy splitting. (English) Zbl 0478.35062 Q. Appl. Math. 39, 351-361 (1981). MSC: 35L05 35L45 35B40 35Q99 35L70 81T08 78A25 PDF BibTeX XML Cite \textit{D. G. Costa} and \textit{W. A. Strauss}, Q. Appl. Math. 39, 351--361 (1981; Zbl 0478.35062) Full Text: DOI OpenURL
Limic, N. The exterior Neumann problem for the Helmholtz equation. (English) Zbl 0478.35028 Glas. Mat., III. Ser. 16(36), 51-64 (1981). MSC: 35J05 35A35 35J25 PDF BibTeX XML Cite \textit{N. Limic}, Glas. Mat., III. Ser. 16(36), 51--64 (1981; Zbl 0478.35028) OpenURL
Singh, M. C.; Frydrychowicz, W. Wave propagation in nonhomogeneous thin elastic rods subjected to time dependent stress impact. (English) Zbl 0477.73014 J. Sound Vib. 79, 341-350 (1981). MSC: 74M20 74J99 35L05 74K10 34B05 35L20 35C05 PDF BibTeX XML Cite \textit{M. C. Singh} and \textit{W. Frydrychowicz}, J. Sound Vib. 79, 341--350 (1981; Zbl 0477.73014) Full Text: DOI OpenURL
Jain, M. K.; Jain, R. K.; Anatha Krishnaiah, U. Hybrid numerical methods for periodic initial value problems involving second-order differential equations. (English) Zbl 0477.65056 Appl. Math. Modelling 5, 53-56 (1981). MSC: 65L05 65L20 70F15 34C25 PDF BibTeX XML Cite \textit{M. K. Jain} et al., Appl. Math. Modelling 5, 53--56 (1981; Zbl 0477.65056) Full Text: DOI OpenURL
Goebel, Manfred Optimal control of coefficients in linear elliptic equations I: Existence of optimal controls. (English) Zbl 0477.49005 Math. Operationsforsch. Stat., Ser. Optimization 12, 525-533 (1981). MSC: 49J20 35J25 49K40 PDF BibTeX XML Cite \textit{M. Goebel}, Math. Operationsforsch. Stat., Ser. Optimization 12, 525--533 (1981; Zbl 0477.49005) Full Text: DOI OpenURL
Fitzgibbon, W. E. Strongly damped quasilinear evolution equations. (English) Zbl 0476.35040 J. Math. Anal. Appl. 79, 536-550 (1981). MSC: 35G10 35K25 35K55 74K10 34G10 47D03 35B60 35B40 PDF BibTeX XML Cite \textit{W. E. Fitzgibbon}, J. Math. Anal. Appl. 79, 536--550 (1981; Zbl 0476.35040) Full Text: DOI OpenURL
Stiller, Peter F. Differential equations associated with elliptic surfaces. (English) Zbl 0476.14014 J. Math. Soc. Japan 33, 203-233 (1981). MSC: 14J25 12H20 34G20 PDF BibTeX XML Cite \textit{P. F. Stiller}, J. Math. Soc. Japan 33, 203--233 (1981; Zbl 0476.14014) Full Text: DOI OpenURL
Vichnevetsky, Robert Computer methods for partial differential equations. Vol. 1: Elliptic equations and the finite-element method. (English) Zbl 0475.65058 Prentice-Hall Series in Computational Mathematics. Englewood Cliffs, New Jersey: Prentice-Hall, Inc. X, 357 p. $ 37.80 (1981). MSC: 65Nxx 35J05 35J25 34B05 65L10 65F05 65F10 74S05 PDF BibTeX XML OpenURL
Khrychev, D. A. On a certain quasilinear stochastic hyperbolic equation. (Russian) Zbl 0475.60044 Mat. Sb., N. Ser. 116(158), 398-426 (1981). MSC: 60H15 35L70 35R60 PDF BibTeX XML Cite \textit{D. A. Khrychev}, Mat. Sb., Nov. Ser. 116(158), 398--426 (1981; Zbl 0475.60044) Full Text: EuDML OpenURL
Patz, Renate; Lange, Otfried Eine notwendige Optimalitaetsbedingung für die Steuerung eines parabolischen Systems in einem nichtzylindrischen Bereich. (German) Zbl 0475.49023 Wiss. Z. Tech. Hochsch. Carl Schorlemmer Leuna-Merseburg 23, 95-99 (1981). MSC: 49K20 35K60 45G10 PDF BibTeX XML Cite \textit{R. Patz} and \textit{O. Lange}, Wiss. Z. Tech. Hochsch. Carl Schorlemmer Leuna-Merseburg 23, 95--99 (1981; Zbl 0475.49023) OpenURL