Men’shikh, O. F. On functionally invariant solutions of a class of quasilinear second order partial differential equations with two independent variables. (Russian) Zbl 0637.35021 Differ. Uravn. 23, No. 6, 1087-1088 (1987). Reviewer: O.F.Men’shikh MSC: 35G20 35Q99 35B40 PDFBibTeX XMLCite \textit{O. F. Men'shikh}, Differ. Uravn. 23, No. 6, 1087--1088 (1987; Zbl 0637.35021)
Budaev, V. D. On unconditional basis property on a closed interval of systems of eigen- and adjoint functions of a second order operator with discontinuous coefficients. (Russian) Zbl 0636.34017 Differ. Uravn. 23, No. 6, 941-952 (1987). Reviewer: B.Šehter MSC: 34L99 42C30 PDFBibTeX XMLCite \textit{V. D. Budaev}, Differ. Uravn. 23, No. 6, 941--952 (1987; Zbl 0636.34017)