Potapov, V. D. Stability of solutions to some integro-differential equations describing the dynamics of visco-elastic systems under random perturbations of their parameters. (English. Russian original) Zbl 0863.45006 Differ. Equations 31, No. 9, 1472-1480 (1995); translation from Differ. Uravn. 31, No. 9, 1518-1524 (1995). Reviewer: V.Chernyatin (Szczecin) MSC: 45K05 74Hxx 93E15 45M10 45M05 PDFBibTeX XMLCite \textit{V. D. Potapov}, Differ. Uravn. 31, No. 9, 1 (1995; Zbl 0863.45006); translation from Differ. Uravn. 31, No. 9, 1518--1524 (1995)
Iskandarov, S. Lower bounds for solutions to a first-order linear homogeneous Volterra integro-differential equation. (English. Russian original) Zbl 0863.45004 Differ. Equations 31, No. 9, 1462-1466 (1995); translation from Differ. Uravn. 31, No. 9, 1508-1512 (1995). Reviewer: V.Chernyatin (Szczecin) MSC: 45J05 45M05 PDFBibTeX XMLCite \textit{S. Iskandarov}, Differ. Uravn. 31, No. 9, 1 (1995; Zbl 0863.45004); translation from Differ. Uravn. 31, No. 9, 1508--1512 (1995)
Nefedov, N. N. The method of differential inequalities for some classes of nonlinear singularly perturbed problems with internal layers. (English. Russian original) Zbl 0864.35011 Differ. Equations 31, No. 7, 1077-1085 (1995); translation from Differ. Uravn. 31, No. 7, 1142-1149 (1995). Reviewer: V.Chernyatin (Szczecin) MSC: 35B25 35J60 35R45 35C20 PDFBibTeX XMLCite \textit{N. N. Nefedov}, Differ. Uravn. 31, No. 7, 1 (1995; Zbl 0864.35011); translation from Differ. Uravn. 31, No. 7, 1142--1149 (1995)
Kashchenko, S. A. Asymptotic behavior of relaxation oscillations in systems of difference-differential equations with a compactly supported nonlinearity. I. (English. Russian original) Zbl 0863.34076 Differ. Equations 31, No. 8, 1275-1285 (1995); translation from Differ. Uravn. 31, No. 8, 1330-1339 (1995). Reviewer: V.Chernyatin (Szczecin) MSC: 34K25 34C15 34K99 34C25 PDFBibTeX XMLCite \textit{S. A. Kashchenko}, Differ. Uravn. 31, No. 8, 1 (1995; Zbl 0863.34076); translation from Differ. Uravn. 31, No. 8, 1330--1339 (1995)
Mikhajlets, V. A. On selfadjoint problems with the given distribution of eigenvalues. (Russian) Zbl 0824.47005 Differ. Uravn. 28, No. 10, 1834-1835 (1992). MSC: 47A20 47B25 PDFBibTeX XMLCite \textit{V. A. Mikhajlets}, Differ. Uravn. 28, No. 10, 1834--1835 (1992; Zbl 0824.47005)
Mitrokhin, S. I. On spectral properties of differential operators with discontinuous coefficients. (Russian) Zbl 0824.47040 Differ. Uravn. 28, No. 3, 530-532 (1992). MSC: 47E05 47A10 PDFBibTeX XMLCite \textit{S. I. Mitrokhin}, Differ. Uravn. 28, No. 3, 530--532 (1992; Zbl 0824.47040)
Ehyubov, R. A. On the asymptotics with respect to a small parameter of the solution of a boundary value problem for a second order quasilinear elliptic equation degenerating to a parabolic one. (Russian) Zbl 0765.35020 Differ. Uravn. 28, No. 1, 163-169 (1992). Reviewer: J.Madjarova (Göteborg) MSC: 35J70 35J65 35B30 35B40 PDFBibTeX XMLCite \textit{R. A. Ehyubov}, Differ. Uravn. 28, No. 1, 163--169 (1992; Zbl 0765.35020)
Bobochko, V. N. Asymptotic integration of a system of differential equations with a turning point. (Russian) Zbl 0739.34050 Differ. Uravn. 27, No. 9, 1505-1515 (1991). Reviewer: A.G.Baskakov (Voronezh) MSC: 34E20 PDFBibTeX XMLCite \textit{V. N. Bobochko}, Differ. Uravn. 27, No. 9, 1505--1515 (1991; Zbl 0739.34050)
Bobochko, V. N. A singularly perturbed problem with a noninvertible limit operator. (Russian) Zbl 0727.34050 Differ. Uravn. 26, No. 8, 1453-1454 (1990). Reviewer: I.Ginchev (Varna) MSC: 34E15 35B40 PDFBibTeX XMLCite \textit{V. N. Bobochko}, Differ. Uravn. 26, No. 8, 1453--1454 (1990; Zbl 0727.34050)
Fomin, V. I. Small perturbations of a singular differential equation with a constant unbounded operator coefficient. (Russian) Zbl 0704.34068 Differ. Uravn. 25, No. 9, 1629-1630 (1989). Reviewer: J.Kalas MSC: 34E10 34G10 PDFBibTeX XMLCite \textit{V. I. Fomin}, Differ. Uravn. 25, No. 9, 1629--1630 (1989; Zbl 0704.34068)
Ivanov, M. A. On the behavior of solutions of a perturbed homogeneous system of second order differential equations. (Russian) Zbl 0702.34046 Differ. Uravn. 25, No. 10, 1810-1812 (1989). Reviewer: V.Sobolev MSC: 34D10 34E10 34C05 PDFBibTeX XMLCite \textit{M. A. Ivanov}, Differ. Uravn. 25, No. 10, 1810--1812 (1989; Zbl 0702.34046)
Ivanov, M. A. On topological equivalence of quasi-homogeneous systems of differential equations. (Russian) Zbl 0692.34040 Differ. Uravn. 25, No. 11, 2016-2017 (1989). Reviewer: V.Răsvan MSC: 34C20 34E10 PDFBibTeX XMLCite \textit{M. A. Ivanov}, Differ. Uravn. 25, No. 11, 2016--2017 (1989; Zbl 0692.34040)
Novakovskaya, L. I. The Cauchy problem for a singularly perturbed integro-differential equation with an unstable spectrum. (Russian) Zbl 0688.45011 Differ. Uravn. 25, No. 9, 1606-1611 (1989). Reviewer: I.I.Vrabie MSC: 45J05 45M05 PDFBibTeX XMLCite \textit{L. I. Novakovskaya}, Differ. Uravn. 25, No. 9, 1606--1611 (1989; Zbl 0688.45011)
Tsalyuk, Z. B. Asymptotic estimates of solutions of a renewal equation. (Russian) Zbl 0666.45001 Differ. Uravn. 25, No. 2, 320-325 (1989). Reviewer: Yang Enhao MSC: 45D05 45M05 PDFBibTeX XMLCite \textit{Z. B. Tsalyuk}, Differ. Uravn. 25, No. 2, 320--325 (1989; Zbl 0666.45001)
Motylev, L. Yu. Perturbation theory in the complex domain for equations of Turritin type with a small parameter at the derivative. (Russian) Zbl 0659.34069 Differ. Uravn. 23, No. 11, 1904-1913 (1987). Reviewer: L.P.Lebedev MSC: 34E20 34E10 34E05 PDFBibTeX XMLCite \textit{L. Yu. Motylev}, Differ. Uravn. 23, No. 11, 1904--1913 (1987; Zbl 0659.34069)
Kostin, A. V. Asymptotics of proper solutions of nonlinear ordinary differential equations. (Russian) Zbl 0654.34048 Differ. Uravn. 23, No. 3, 524-526 (1987). Reviewer: D.Bainov MSC: 34E05 34A34 PDFBibTeX XMLCite \textit{A. V. Kostin}, Differ. Uravn. 23, No. 3, 524--526 (1987; Zbl 0654.34048)
Konyaev, Yu. A. Sequential analysis of periodic systems with a small parameter at the derivative involving purely imaginary (including identically multiple) points of the spectrum of the limit operator. (Russian) Zbl 0589.34032 Differ. Uravn. 21, No. 6, 1085-1089 (1985). Reviewer: P.T.Crăciunaş MSC: 34C25 34E05 34E10 PDFBibTeX XMLCite \textit{Yu. A. Konyaev}, Differ. Uravn. 21, No. 6, 1085--1089 (1985; Zbl 0589.34032)
Samarina, S. M. Collapse of continuous solutions of a quasilinear integro-differential equation. (Russian) Zbl 0582.45031 Differ. Uravn. 21, No. 8, 1454-1456 (1985). Reviewer: G.Cimmino MSC: 45K05 45M05 PDFBibTeX XMLCite \textit{S. M. Samarina}, Differ. Uravn. 21, No. 8, 1454--1456 (1985; Zbl 0582.45031)
Berezanskij, L. M. Existence and stability of solutions of linear functional-differential equations in Lebesgue spaces with weight. (Russian) Zbl 0581.45004 Differ. Uravn. 21, No. 6, 1052-1059 (1985). Reviewer: J.Banás MSC: 45G10 45M05 45M10 PDFBibTeX XMLCite \textit{L. M. Berezanskij}, Differ. Uravn. 21, No. 6, 1052--1059 (1985; Zbl 0581.45004)
Kogan, Kh. M.; Sakhnovich, L. A. Spectral asymptotics of a singular integro-differential operator. (Russian) Zbl 0562.47028 Differ. Uravn. 20, No. 8, 1444-1447 (1984). Reviewer: N.Bozhinov MSC: 47B38 47A10 47Gxx 45J05 PDFBibTeX XMLCite \textit{Kh. M. Kogan} and \textit{L. A. Sakhnovich}, Differ. Uravn. 20, No. 8, 1444--1447 (1984; Zbl 0562.47028)
Kalyakin, L. A. Asymptotics of the solution of a system of two linear equations of magnetohydrodynamics with singular perturbation. I. Standard problem in an elliptic layer. (Russian) Zbl 0516.76029 Differ. Uravn. 18, No. 10, 1724-1738 (1982). MSC: 76D99 35J55 35A05 76W05 PDFBibTeX XMLCite \textit{L. A. Kalyakin}, Differ. Uravn. 18, 1724--1738 (1982; Zbl 0516.76029)
Vasil’eva, A. B. On periodic solutions of equations of elliptic type with small parameters. (Russian) Zbl 0514.35032 Differ. Uravn. 18, 2174-2178 (1982). MSC: 35J65 35B40 35B10 35C10 PDFBibTeX XMLCite \textit{A. B. Vasil'eva}, Differ. Uravn. 18, 2174--2178 (1982; Zbl 0514.35032)
Zhdanova, G. V. Formal asymptotics of a fundamental system of solutions of a certain equation of elasticity. (Russian) Zbl 0511.73016 Differ. Uravn. 18, No. 10, 1820-1822 (1982). MSC: 74B99 74K20 34E05 74H45 PDFBibTeX XMLCite \textit{G. V. Zhdanova}, Differ. Uravn. 18, 1820--1822 (1982; Zbl 0511.73016)
Dolov, M. V. The structure of a univalent integrating factor close to a cycle. (Russian) Zbl 0477.34022 Differ. Uravn. 17, 1490-1492 (1981). MSC: 34C05 37-XX PDFBibTeX XMLCite \textit{M. V. Dolov}, Differ. Uravn. 17, 1490--1492 (1981; Zbl 0477.34022)
Valiev, M. A.; Lomov, S. A. Asymptotic integration of singularly perturbed problems in Hilbert space. (Russian) Zbl 0475.35014 Differ. Uravn. 17, 1792-1805 (1981). MSC: 35B25 35G10 35K25 34G10 35R20 PDFBibTeX XMLCite \textit{M. A. Valiev} and \textit{S. A. Lomov}, Differ. Uravn. 17, 1792--1805 (1981; Zbl 0475.35014)
Sergeev, I. N. Die Invarianz der Zentralindizes in bezug auf die Störungen, die im Unendlichen gegen Null streben. (Russian) Zbl 0445.34011 Differ. Uravn. 16, 1719 (1980). MSC: 34E10 34A30 34C99 PDFBibTeX XMLCite \textit{I. N. Sergeev}, Differ. Uravn. 16, 1719 (1980; Zbl 0445.34011)
Falin, A. I. Über eine Stabilitätsuntersuchung bei beständig wirkenden Störungen in einem ”neutralen” Spezialfall. (Russian) Zbl 0421.34062 Differ. Uravn. 15, 2278-2281 (1979). MSC: 34E10 PDFBibTeX XMLCite \textit{A. I. Falin}, Differ. Uravn. 15, 2278--2281 (1979; Zbl 0421.34062)
Kaljakin, L. A. Eine Konstruktion der Asymptotik der Lösung eines Problems der Magneto- Hydrodynamik mit einem kleinen Parameter. I: Geradlinige Strömung in einem rechteckigen Kanal. Eine senkrecht zu einem Magnetfeld supraleitende Wand. (Russian) Zbl 0403.35091 Differ. Uravn. 15, 668-680 (1979). MSC: 35Q99 35B40 35B25 76W05 35J15 35J25 PDFBibTeX XMLCite \textit{L. A. Kaljakin}, Differ. Uravn. 15, 668--680 (1979; Zbl 0403.35091)
Maksudov, R. Über eine asymptotische Entwicklung der Lösungen gewisser Integro- Differentialgleichungen. (Russian) Zbl 0409.45007 Differ. Uravn. 14, 2047-2051 (1978). MSC: 45J05 45M05 PDFBibTeX XMLCite \textit{R. Maksudov}, Differ. Uravn. 14, 2047--2051 (1978; Zbl 0409.45007)
Ramm, A. G. On eigenvalues of certain integral operators. (Russian) Zbl 0407.47027 Differ. Uravn. 14, 932-934 (1978). MSC: 47F05 47Gxx 47A55 PDFBibTeX XMLCite \textit{A. G. Ramm}, Differ. Uravn. 14, 932--934 (1978; Zbl 0407.47027)
Belyanin, M. P. Über ein System von Integro-Differentialgleichungen bedingt stabilen Typs mit einem kleinen Parameter bei der Ableitung. (Russian) Zbl 0404.45005 Differ. Uravn. 14, 1497-1501 (1978). MSC: 45J05 45M05 PDFBibTeX XMLCite \textit{M. P. Belyanin}, Differ. Uravn. 14, 1497--1501 (1978; Zbl 0404.45005)
Vasil’eva, A. B.; Hasanov, A. A. Über eine stabile Anfangsmannigfaltigkeit für eine Integrodifferentialgleichung im kritischen Fall. (Russian) Zbl 0391.45009 Differ. Uravn. 13, 2063-2069 (1977). MSC: 45K05 45M05 PDFBibTeX XMLCite \textit{A. B. Vasil'eva} and \textit{A. A. Hasanov}, Differ. Uravn. 13, 2063--2069 (1977; Zbl 0391.45009)
Reinfeld, A. A. Glatte Linearisierung eines ”Knotens”. (Russian) Zbl 0379.34031 Differ. Uravn. 13, 1885-1887 (1977). MSC: 34C20 34A30 34E10 PDFBibTeX XMLCite \textit{A. A. Reinfeld}, Differ. Uravn. 13, 1885--1887 (1977; Zbl 0379.34031)
Derbenev, V. A. Zur Frage des asymptotischen Verhaltens der Gleichung der Erneuerung. (Russian) Zbl 0334.45016 Differ. Uravn. 12, 743-746 (1976). MSC: 45M05 PDFBibTeX XMLCite \textit{V. A. Derbenev}, Differ. Uravn. 12, 743--746 (1976; Zbl 0334.45016)
Ershov, E. K. Über die Stabilität der Drehzahl einer zweifach periodischen Differentialgleichung. (Russian) Zbl 0331.34036 Differ. Uravn. 11, 1949-1955 (1975). MSC: 34C25 34D10 34E10 PDFBibTeX XMLCite \textit{E. K. Ershov}, Differ. Uravn. 11, 1949--1955 (1975; Zbl 0331.34036)
Churin, Yu. V. A criterion for the simple vanishing of the periodic solution of a quasihomogeneous system. (Russian) Zbl 0324.34034 Differ. Uravn. 11, No. 5, 937-939 (1975). Reviewer: M. Bartušek MSC: 34C25 34E10 PDFBibTeX XMLCite \textit{Yu. V. Churin}, Differ. Uravn. 11, 937--939 (1975; Zbl 0324.34034)
Bykov, Ja. V.; Kirii, K. A. Über periodische Schwingungen mit einer großen Amplitude. (Russian) Zbl 0322.34024 Differ. Uravn. 11, 604-610 (1975). MSC: 34C25 34A25 34E10 PDFBibTeX XMLCite \textit{Ja. V. Bykov} and \textit{K. A. Kirii}, Differ. Uravn. 11, 604--610 (1975; Zbl 0322.34024)
Pulyaev, V. F.; Tsalyuk, Z. B. Über asymptotisch \(\omega\)-periodische Lösungen Volterrascher Integralgleichungen. (Russian) Zbl 0308.45018 Differ. Uravn. 10, 1103-1110 (1974). MSC: 45M05 45D05 PDFBibTeX XMLCite \textit{V. F. Pulyaev} and \textit{Z. B. Tsalyuk}, Differ. Uravn. 10, 1103--1110 (1974; Zbl 0308.45018)
Derbenev, V. A.; Tsalyuk, Z. B. On the question of asymptotic expansion of the solutions of the renewal equation. (Zur Frage der asymptotischen Entwicklung der Lösungen der Wiederherstellungsgleichung.) (Russian) Zbl 0286.45003 Differ. Uravn. 10, 335-341 (1974). MSC: 45D05 45M05 PDFBibTeX XMLCite \textit{V. A. Derbenev} and \textit{Z. B. Tsalyuk}, Differ. Uravn. 10, 335--341 (1974; Zbl 0286.45003) Full Text: MNR
Popov, G. E. Über ein Verfahren zur Konstruktion integrierbarer linearer Gleichungen mit einem kleinen Parameter. (Russian) Zbl 0282.34040 Differ. Uravn. 10, 555-557 (1974). MSC: 34E10 34A30 34A05 34B30 34A45 PDFBibTeX XMLCite \textit{G. E. Popov}, Differ. Uravn. 10, 555--557 (1974; Zbl 0282.34040)
Ohrimenko, M. G. Über einige Eigenschaften homogener Differentialsysteme. (Russian) Zbl 0298.34003 Differ. Uravn. 9, 2272-2275 (1973). MSC: 34A05 34E10 49K15 PDFBibTeX XMLCite \textit{M. G. Ohrimenko}, Differ. Uravn. 9, 2272--2275 (1973; Zbl 0298.34003)
Ceran, S. E. Grenzlagen der Schmiegungsebenen von Trajektorien nichtlinearer Systeme. (Russian) Zbl 0277.34031 Differ. Uravn. 9, 386-388 (1973). MSC: 34C05 37-XX 34E10 PDFBibTeX XMLCite \textit{S. E. Ceran}, Differ. Uravn. 9, 386--388 (1973; Zbl 0277.34031)
Krecetov, G. S. Störungen, die die Eigenschaft der Stabilität erhalten. (Russian) Zbl 0266.34051 Differ. Uravn. 8, 2090-2092 (1972). MSC: 34D10 34D20 34E10 PDFBibTeX XMLCite \textit{G. S. Krecetov}, Differ. Uravn. 8, 2090--2092 (1972; Zbl 0266.34051)
Lika, D. K.; Ryabov, Yu. A. Konvergenz der Methode des kleinen Parameters bei der Konstruktion der periodischen Lösungen gewöhnlicher Differentialgleichungen neutralen Typs mit kleiner Retardierung. (Russian) Zbl 0247.34077 Differ. Uravn. 8, 1977-1987 (1972). MSC: 34K99 34E10 PDFBibTeX XMLCite \textit{D. K. Lika} and \textit{Yu. A. Ryabov}, Differ. Uravn. 8, 1977--1987 (1972; Zbl 0247.34077)
Kammatov, K. K. Über Schwingungen in einigen wesentlich nichtlinearen Systemen. (Russian) Zbl 0246.34041 Differ. Uravn. 7, 997-1006 (1971). MSC: 34C15 34C30 34E10 PDFBibTeX XMLCite \textit{K. K. Kammatov}, Differ. Uravn. 7, 997--1006 (1971; Zbl 0246.34041)
Smolin, Yu. N. Über die Wachstumsordnung der Resolventenkerne eines Systems Volterrascher Integralgleichungen mit periodischen Kernen und Retardierungen. (Russian) Zbl 0245.45002 Differ. Uravn. 7, 2246-2252 (1971). MSC: 45D05 45M05 45F05 PDFBibTeX XMLCite \textit{Yu. N. Smolin}, Differ. Uravn. 7, 2246--2252 (1971; Zbl 0245.45002)
Pliss, V. A. Über die Grobheit einer Folge von linearen Differentialgleichungssystemen zweiter Ordnung mit periodischen Koeffizienten. (Russian) Zbl 0243.34017 Differ. Uravn. 7, 261-270 (1971). MSC: 34A30 34C99 34D05 34E10 PDFBibTeX XMLCite \textit{V. A. Pliss}, Differ. Uravn. 7, 261--270 (1971; Zbl 0243.34017)
Tsalyuk, Z. B.; Samsutdinov, M. M. Über die Existenz einer Grenze der Lösung einer nichtlinearen Volterraschen Gleichung für \(t \to \infty\). (Russian) Zbl 0241.45009 Differ. Uravn. 7, 2253-2258 (1971). MSC: 45M05 45D05 PDFBibTeX XMLCite \textit{Z. B. Tsalyuk} and \textit{M. M. Samsutdinov}, Differ. Uravn. 7, 2253--2258 (1971; Zbl 0241.45009)
Shestakov, A. A. Criteria for uniform asymptotic stability with respect to a nonautonomous homogeneous approximation of order \(m \geq 1\). (Russian) Zbl 0231.34045 Differ. Uravn. 7, 937-940 (1971). MSC: 34D20 34D10 34E10 PDFBibTeX XMLCite \textit{A. A. Shestakov}, Differ. Uravn. 7, 937--940 (1971; Zbl 0231.34045)
Makeeva, I. E. The convergence of certain nonlinear equations of third order. (Russian) Zbl 0222.34030 Differ. Uravn. 7, 1327-1329 (1971). MSC: 34A34 34E10 34D20 PDFBibTeX XMLCite \textit{I. E. Makeeva}, Differ. Uravn. 7, 1327--1329 (1971; Zbl 0222.34030)
Ved’, Yu. A. Asymptotic estimates of solutions of a class of nonlinear integro- differential equations. (Russian) Zbl 0221.45018 Differ. Uravn. 7, 1097-1107 (1971). MSC: 45M05 45J05 PDFBibTeX XMLCite \textit{Yu. A. Ved'}, Differ. Uravn. 7, 1097--1107 (1971; Zbl 0221.45018)
Smolin, Yu. N. Über das asymptotische Verhalten der Lösung eines quasilinearen Systems Volterrascher Integralgleichungen mit konstanter Retardierung des Arguments. (Russian) Zbl 0218.45009 Differ. Uravn. 7, 1133-1134 (1971). MSC: 45M05 45D05 PDFBibTeX XMLCite \textit{Yu. N. Smolin}, Differ. Uravn. 7, 1133--1134 (1971; Zbl 0218.45009)
Tikhonova, Eh. A. Analogies and homeomorphism between perturbed and unperturbed systems with block-triangular matrices. (Russian) Zbl 0224.34030 Differ. Uravn. 6, 1221-1229 (1970). MSC: 34A30 34C20 34E10 PDFBibTeX XMLCite \textit{Eh. A. Tikhonova}, Differ. Uravn. 6, 1221--1229 (1970; Zbl 0224.34030)
Tsalyuk, Z. B.; Shamsutdinov, M. M. Zur Frage des asymptotischen Verhaltens der Lösungen linearer Volterrascher Integralgleichungen. (Russian) Zbl 0209.42502 Differ. Uravn. 6, 1567-1573 (1970). MSC: 45M05 45F05 45D05 PDFBibTeX XMLCite \textit{Z. B. Tsalyuk} and \textit{M. M. Shamsutdinov}, Differ. Uravn. 6, 1567--1573 (1970; Zbl 0209.42502)
Tsalyuk, Z. B. On the asymptotic behavior of the solutions of the renewal equation. (Über das asymptotische Verhalten der Lösungen der Erneuerungsgleichung.) (Russian) Zbl 0198.15001 Differ. Uravn. 6, 1112-1114 (1970). Reviewer: K. Deimling MSC: 45G15 45M05 PDFBibTeX XMLCite \textit{Z. B. Tsalyuk}, Differ. Uravn. 6, 1112--1114 (1970; Zbl 0198.15001)
Burkova, L. V. Über das asymptotische Verhalten der Lösungen einer nichtlinearen Integrodifferentialgleichung. (Russian) Zbl 0213.39001 Differ. Uravn. 5, 757-761 (1969). MSC: 45M05 45J05 PDFBibTeX XMLCite \textit{L. V. Burkova}, Differ. Uravn. 5, 757--761 (1969; Zbl 0213.39001)