Amangil’din, T. G. A regularized trace of the Sturm-Liouville operator. (Russian) Zbl 0701.34080 Differ. Uravn. 25, No. 8, 1439-1441 (1989). Reviewer: J.Appell MSC: 34L05 PDFBibTeX XMLCite \textit{T. G. Amangil'din}, Differ. Uravn. 25, No. 8, 1439--1441 (1989; Zbl 0701.34080)
Ryazantseva, I. P. A stable method for determining pseudosolutions of nonlinear equations with monotone operators. (Russian) Zbl 0698.47050 Differ. Uravn. 25, No. 8, 1457-1459 (1989). Reviewer: R.Iino MSC: 47J05 47H05 PDFBibTeX XMLCite \textit{I. P. Ryazantseva}, Differ. Uravn. 25, No. 8, 1457--1459 (1989; Zbl 0698.47050)
Bzhykhchy, S. On an estimate of the modulus of the solution of a nonlinear system of differential-functional equations of parabolic type. (Russian) Zbl 0698.35012 Differ. Uravn. 25, No. 8, 1444-1446 (1989). Reviewer: Z.Kamont MSC: 35B05 35K45 35R45 PDFBibTeX XMLCite \textit{S. Bzhykhchy}, Differ. Uravn. 25, No. 8, 1444--1446 (1989; Zbl 0698.35012)
Bespalova, S. A.; Klokov, Yu. A. On a boundary value problem with a condition at infinity for third order equations. (Russian) Zbl 0697.34017 Differ. Uravn. 25, No. 8, 1441-1443 (1989). Reviewer: J.Appell MSC: 34A34 34A12 PDFBibTeX XMLCite \textit{S. A. Bespalova} and \textit{Yu. A. Klokov}, Differ. Uravn. 25, No. 8, 1441--1443 (1989; Zbl 0697.34017)
Abdushukurov, A. Integral representation of solutions of a Moisil-Teodoresco system with singularities in the lower terms. (Russian) Zbl 0695.35017 Differ. Uravn. 25, No. 8, 1436-1439 (1989). Reviewer: V.A.Kostova MSC: 35C15 35F05 PDFBibTeX XMLCite \textit{A. Abdushukurov}, Differ. Uravn. 25, No. 8, 1436--1439 (1989; Zbl 0695.35017)
Lapachugina, M. I.; Leonov, G. A. A frequency criterion for instability in the large of nonlinear dynamical systems. (Russian) Zbl 0695.34048 Differ. Uravn. 25, No. 8, 1451-1453 (1989). Reviewer: J.Šiška MSC: 37-XX 34A34 34D20 PDFBibTeX XMLCite \textit{M. I. Lapachugina} and \textit{G. A. Leonov}, Differ. Uravn. 25, No. 8, 1451--1453 (1989; Zbl 0695.34048)
Sumin, M. I. Optimal control of objects described by quasilinear elliptic equations. (Russian) Zbl 0691.49022 Differ. Uravn. 25, No. 8, 1406-1416 (1989). Reviewer: M.I.Sumin MSC: 49K20 35B37 PDFBibTeX XMLCite \textit{M. I. Sumin}, Differ. Uravn. 25, No. 8, 1406--1416 (1989; Zbl 0691.49022)
Karov, Kh. M. An inequality of Hilbert type with respect to a system of eigen- and associated functions of a second order differential operator for odd and even functions. (Russian) Zbl 0691.34018 Differ. Uravn. 25, No. 8, 1307-1312 (1989). Reviewer: M.Möller MSC: 34L99 PDFBibTeX XMLCite \textit{Kh. M. Karov}, Differ. Uravn. 25, No. 8, 1307--1312 (1989; Zbl 0691.34018)
Pokornyj, Yu. V.; Lazarev, K. P.; Gareeva, T. M. On nonlocal boundary value problems for ordinary differential equations. (Russian) Zbl 0691.34013 Differ. Uravn. 25, No. 8, 1321-1332 (1989). Reviewer: M.Möller MSC: 34B10 34B27 PDFBibTeX XMLCite \textit{Yu. V. Pokornyj} et al., Differ. Uravn. 25, No. 8, 1321--1332 (1989; Zbl 0691.34013)
Dovletov, D. M. On a nonlocal boundary value problem of first kind in differential and difference treatments. (Russian) Zbl 0691.34012 Differ. Uravn. 25, No. 8, 1297-1307 (1989). Reviewer: M.Möller MSC: 34B10 PDFBibTeX XMLCite \textit{D. M. Dovletov}, Differ. Uravn. 25, No. 8, 1297--1307 (1989; Zbl 0691.34012)
Litvinchev, I. S. Decomposition in dynamic problems with mixed constraints. (Russian) Zbl 0689.49031 Differ. Uravn. 25, No. 8, 1453-1457 (1989). Reviewer: I.S.Litvinchev MSC: 49M27 49K99 65K10 PDFBibTeX XMLCite \textit{I. S. Litvinchev}, Differ. Uravn. 25, No. 8, 1453--1457 (1989; Zbl 0689.49031)
Khludnev, A. M. On the convergence of solutions in problems of optimal control of variational fourth-order inequalities. (Russian) Zbl 0688.49006 Differ. Uravn. 25, No. 8, 1427-1435 (1989). Reviewer: A.M.Khludnev MSC: 49J40 PDFBibTeX XMLCite \textit{A. M. Khludnev}, Differ. Uravn. 25, No. 8, 1427--1435 (1989; Zbl 0688.49006)
Gil’, M. I. The “freezing” method for nonlinear equations. (Russian) Zbl 0688.34021 Differ. Uravn. 25, No. 8, 1291-1297 (1989). Reviewer: R.Kodnar MSC: 34C11 34A34 PDFBibTeX XMLCite \textit{M. I. Gil'}, Differ. Uravn. 25, No. 8, 1291--1297 (1989; Zbl 0688.34021)
Kashchenko, S. A. An application of the normalization method to the investigation of the dynamics of a differential-difference equation with a small factor at the derivative. (Russian) Zbl 0686.34070 Differ. Uravn. 25, No. 8, 1448-1451 (1989). Reviewer: W.Seda MSC: 34K99 34K20 PDFBibTeX XMLCite \textit{S. A. Kashchenko}, Differ. Uravn. 25, No. 8, 1448--1451 (1989; Zbl 0686.34070)
Sadovnichij, V. A.; Dubrovskij, V. V.; Nagornyj, A. V. Asymptotics of the spectral function of a discrete operator. (Russian) Zbl 0684.47001 Differ. Uravn. 25, No. 8, 1340-1344 (1989). Reviewer: R.Duducava MSC: 47A10 47B15 PDFBibTeX XMLCite \textit{V. A. Sadovnichij} et al., Differ. Uravn. 25, No. 8, 1340--1344 (1989; Zbl 0684.47001)
Tuzik, A. I. On the solvability of a discrete equation of convolution type with variable coefficients. (Russian) Zbl 0683.39002 Differ. Uravn. 25, No. 8, 1462-1464 (1989). Reviewer: Ju.V.Kostarchuk MSC: 39A10 PDFBibTeX XMLCite \textit{A. I. Tuzik}, Differ. Uravn. 25, No. 8, 1462--1464 (1989; Zbl 0683.39002)
Ignat’ev, A. O. On the stability of almost periodic systems with respect to a part of the variables. (Russian) Zbl 0682.34040 Differ. Uravn. 25, No. 8, 1446-1448 (1989). Reviewer: V.Komkov MSC: 34D20 34C27 PDFBibTeX XMLCite \textit{A. O. Ignat'ev}, Differ. Uravn. 25, No. 8, 1446--1448 (1989; Zbl 0682.34040)
Samarina, S. M. On a generalization of the method of characteristics for a nonlocal quasilinear equation. (Russian) Zbl 0681.45007 Differ. Uravn. 25, No. 8, 1459-1462 (1989). Reviewer: A.Lorenzi MSC: 45K05 45G10 PDFBibTeX XMLCite \textit{S. M. Samarina}, Differ. Uravn. 25, No. 8, 1459--1462 (1989; Zbl 0681.45007)