Nikolenko, P. V. On the construction of the preimage of zero of a nonnegative solution of a homogeneous equation with biharmonic principal part. (Russian) Zbl 0731.35001 Differ. Uravn. 25, No. 6, 1058-1059 (1989). Reviewer: A.Klíč (Praha) MSC: 35B05 35J40 PDFBibTeX XMLCite \textit{P. V. Nikolenko}, Differ. Uravn. 25, No. 6, 1058--1059 (1989; Zbl 0731.35001)
Barabanov, O. O. On averaging of elasto-plastic media in case of bulk loads. (Russian) Zbl 0726.73028 Differ. Uravn. 25, No. 6, 1043-1045 (1989). MSC: 74R20 74S30 74P10 49J52 74C99 PDFBibTeX XMLCite \textit{O. O. Barabanov}, Differ. Uravn. 25, No. 6, 1043--1045 (1989; Zbl 0726.73028)
Bereslavskij, Eh. N. On integration in closed form of a class of Fuchs equations and its application. (Russian) Zbl 0713.34002 Differ. Uravn. 25, No. 6, 1048-1050 (1989). Reviewer: S.G.Hristova MSC: 34A05 34A99 PDFBibTeX XMLCite \textit{Eh. N. Bereslavskij}, Differ. Uravn. 25, No. 6, 1048--1050 (1989; Zbl 0713.34002)
Nozdracheva, V. P. Existence of tangential O-curves of an algebroid system of differential equations in some degenerate cases. (Russian) Zbl 0707.34042 Differ. Uravn. 25, No. 6, 1059-1062 (1989). Reviewer: J.Appell MSC: 34C99 PDFBibTeX XMLCite \textit{V. P. Nozdracheva}, Differ. Uravn. 25, No. 6, 1059--1062 (1989; Zbl 0707.34042)
Lunkevich, V. A.; Sibirskij, K. S. Square zero-systems of differential equations. (Russian) Zbl 0707.34033 Differ. Uravn. 25, No. 6, 1056-1058 (1989). Reviewer: J.Appell MSC: 34C20 PDFBibTeX XMLCite \textit{V. A. Lunkevich} and \textit{K. S. Sibirskij}, Differ. Uravn. 25, No. 6, 1056--1058 (1989; Zbl 0707.34033)
Ruzaev, V. P. On the bifurcation problem of the invariant torus \(T^ m\to T^{m+1}\). (Russian) Zbl 0707.34031 Differ. Uravn. 25, No. 6, 1066-1069 (1989). Reviewer: J.Appell MSC: 34C20 PDFBibTeX XMLCite \textit{V. P. Ruzaev}, Differ. Uravn. 25, No. 6, 1066--1069 (1989; Zbl 0707.34031)
Lomov, I. S. On basis property of root functions of operators with multi-point boundary conditions. (Russian) Zbl 0706.34017 Differ. Uravn. 25, No. 6, 1053-1056 (1989). Reviewer: P.S.Milojevic MSC: 34B10 34B24 PDFBibTeX XMLCite \textit{I. S. Lomov}, Differ. Uravn. 25, No. 6, 1053--1056 (1989; Zbl 0706.34017)
Brzychczy, S. On an estimate of the rate of convergence of Chaplygin’s successive approximations for a parabolic system of differential-functional equations. (Russian) Zbl 0705.35064 Differ. Uravn. 25, No. 6, 1050-1052 (1989). Reviewer: V.Ďurikovič MSC: 35K55 65M99 65N99 65N15 PDFBibTeX XMLCite \textit{S. Brzychczy}, Differ. Uravn. 25, No. 6, 1050--1052 (1989; Zbl 0705.35064)
Pron’kin, V. S. On the vanishing of the reducibility phenomenon of systems with quasiperiodic coefficients. (Russian) Zbl 0705.34063 Differ. Uravn. 25, No. 6, 1073-1075 (1989). Reviewer: I.Ginchev MSC: 34D20 PDFBibTeX XMLCite \textit{V. S. Pron'kin}, Differ. Uravn. 25, No. 6, 1073--1075 (1989; Zbl 0705.34063)
Sapronov, Yu. I. Two-mode bifurcation of solutions of the Kármán equation. (Russian) Zbl 0703.35061 Differ. Uravn. 25, No. 6, 1078-1081 (1989). Reviewer: I.Evzerov MSC: 35J60 35J45 35B32 PDFBibTeX XMLCite \textit{Yu. I. Sapronov}, Differ. Uravn. 25, No. 6, 1078--1081 (1989; Zbl 0703.35061)
Mansimov, K. B. On optimality of singular controls in systems with delay controlled by means of initial functions. (Russian) Zbl 0702.49003 Differ. Uravn. 25, No. 6, 1081-1084 (1989). MSC: 49J25 PDFBibTeX XMLCite \textit{K. B. Mansimov}, Differ. Uravn. 25, No. 6, 1081--1084 (1989; Zbl 0702.49003)
Oganesyan, G. R. An initial value problem for some singular hyperbolic equations and WKB- estimates of its solutions. (Russian) Zbl 0697.35080 Differ. Uravn. 25, No. 6, 1062-1064 (1989). Reviewer: G.R.Oganesyan MSC: 35L15 PDFBibTeX XMLCite \textit{G. R. Oganesyan}, Differ. Uravn. 25, No. 6, 1062--1064 (1989; Zbl 0697.35080)
Rastorguev, V. A. Regularized trace of an operator with a weak singularity. (Russian) Zbl 0697.34051 Differ. Uravn. 25, No. 6, 1075-1078 (1989). Reviewer: J.Appell MSC: 34E05 34A30 PDFBibTeX XMLCite \textit{V. A. Rastorguev}, Differ. Uravn. 25, No. 6, 1075--1078 (1989; Zbl 0697.34051)
Drik, N. G. Asymptotics of solutions of a nonlinear differential equation of second order in a particular case. (Russian) Zbl 0695.34008 Differ. Uravn. 25, No. 6, 1071-1072 (1989). Reviewer: I.Gumowski MSC: 34A34 PDFBibTeX XMLCite \textit{N. G. Drik}, Differ. Uravn. 25, No. 6, 1071--1072 (1989; Zbl 0695.34008)
Gorbuzov, V. N.; Krushel’nitskij, A. A. On the number of polynomial solutions of various degrees of algebraic differential equations. (Russian) Zbl 0694.34012 Differ. Uravn. 25, No. 6, 1069-1071 (1989). MSC: 34A99 PDFBibTeX XMLCite \textit{V. N. Gorbuzov} and \textit{A. A. Krushel'nitskij}, Differ. Uravn. 25, No. 6, 1069--1071 (1989; Zbl 0694.34012)
Orlovskij, D. G. On an inverse problem for a second order differential equation in Banach space. (Russian) Zbl 0692.34064 Differ. Uravn. 25, No. 6, 1000-1009 (1989). Reviewer: H.O.Fattorini MSC: 34G10 34A55 35Q99 93B05 PDFBibTeX XMLCite \textit{D. G. Orlovskij}, Differ. Uravn. 25, No. 6, 1000--1009 (1989; Zbl 0692.34064)
Barbashina, E. E. Necessary conditions of Copa-Moir type for a Goursat-Darboux system. (Russian) Zbl 0689.49021 Differ. Uravn. 25, No. 6, 1045-1047 (1989). Reviewer: E.E.Barbashina MSC: 49K15 PDFBibTeX XMLCite \textit{E. E. Barbashina}, Differ. Uravn. 25, No. 6, 1045--1047 (1989; Zbl 0689.49021)
Lantsman, M. Kh. Asymptotic similarity of sets and polynomials. (Russian) Zbl 0689.34055 Differ. Uravn. 25, No. 6, 1052-1053 (1989). MSC: 34E99 PDFBibTeX XMLCite \textit{M. Kh. Lantsman}, Differ. Uravn. 25, No. 6, 1052--1053 (1989; Zbl 0689.34055)
Popkhristov, Khr. B.; Krystev, G. A. A new case of integrability by quadratures of the general Riccati equation. (Russian) Zbl 0688.34002 Differ. Uravn. 25, No. 6, 1065 (1989). Reviewer: R.Kodnar MSC: 34A05 34A45 PDFBibTeX XMLCite \textit{Khr. B. Popkhristov} and \textit{G. A. Krystev}, Differ. Uravn. 25, No. 6, 1065 (1989; Zbl 0688.34002)