Differentsial'nye Uravneniya
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 Conditions for Hölder continuity of bounded generalized solutions of quasilinear equations of elliptic typeA. H. Gudiev 3 Some boundary value problems for Darboux's equationV. I. Evsin 16 Stabilization of solutions of boundary value problems for a second-order parabolic equation with one space variableT. I. Zelenyak 34 A problem of Frankl' for a nonlinear equation of mixed typeI. V. Maiorov 46 A three-dimensional analog of Gellerstedt's problemA. M. Nakhushev 52 A functional method of solving Tricomi's problemV. I. Paškovskii 63 Some conditions for the uniqueness of the solution of the exterior inverse problem of potential theory with variable densityA. I. Prilepko 74 A one-dimensional inverse problem for the telegraph equationV. G. Romanov 87 Some cases of overdetermination of a problem on the oblique derivativeA. I. Yanushauskas 102 Harnack's inequality for generalized solutions of second order degenerate elliptic equationsL. P. Kuptsov 110 The Fredholmicity of certain boundary value problems for the equation $u_{xx}+yu_{yy}+\alpha(x,y)u_y+\beta(x,y)u_x+\gamma(x,y)u=f(x,y)$ in a mixed domainI. M. Petrushko 123 The unimprovability of the error estimate of the method of refinements with higher order differences in a certain class of solutions of Poisson's equationsE. A. Volkov 136 The first boundary value problem for a certain elliptic equation which degenerates on the boundary of the domainG. N. Yakovlev 140 A certain problem of A. V. Bicadze for degenerate elliptic equationsG. N. Yakovlev 147 The approximation of the solution of the Dirichlet problem by the method of fictitious domainsV. D. Kopchenov 151 The two-fold expansion of a certain non-selfadjoint boundary value problem in series of eigenfunctionsA. O. Kravitsky 165 Short Communications Zur Analyse der Stabilität starker Diskontinuitäten in der GasdynamikS. K. Aslanov 178 People of Soviet science Ill'ja Nesterovic Vekua. (Zum 60 Geburtstag)A. V. Bitsadze 180