Roĭtberg, Ya. A.; Sheftel’, Z. G. Boundary value problems and eigenvalue problems for equations of elliptic type with discontinuous coefficients. (Randwertaufgaben und Aufgaben über Eigenwerte für Gleichungen vom elliptischen Typ mit unstetigen Koeffizienten.) (Russian) Zbl 0168.08502 Mat. Fiz. 1965, 119-135 (1965). Reviewer: Alois Kufner (Praha) MSC: 35R05 35Jxx 35Pxx PDFBibTeX XMLCite \textit{Ya. A. Roĭtberg} and \textit{Z. G. Sheftel'}, Mat. Fiz. 1965, 119--135 (1965; Zbl 0168.08502)
Roĭtberg, Ya. A.; Sheftel’, Z. G. Energy inequalities for elliptic operators with discontinuous coefficients and for general boundary conditions and conjugation conditions. (English. Russian original) Zbl 0131.09901 Sov. Math., Dokl. 4, 141-143 (1963); translation from Dokl. Akad. Nauk SSSR 148, 531-533 (1963). Reviewer: F. R. Dias Agudo MSC: 35Jxx 35R05 PDFBibTeX XMLCite \textit{Ya. A. Roĭtberg} and \textit{Z. G. Sheftel'}, Sov. Math., Dokl. 4, 141--143 (1963; Zbl 0131.09901); translation from Dokl. Akad. Nauk SSSR 148, 531--533 (1963)
Roĭtberg, Ya. A.; Sheftel’, Z. G. General boundary-value problems for elliptic equations with discontinuous coefficients. (English. Russian original) Zbl 0125.33202 Sov. Math., Dokl. 4, 231-234 (1963); translation from Dokl. Akad. Nauk SSSR 148, 1034-1037 (1963). Reviewer: M. Schechter MSC: 35J25 35R05 PDFBibTeX XMLCite \textit{Ya. A. Roĭtberg} and \textit{Z. G. Sheftel'}, Sov. Math., Dokl. 4, 231--234 (1963; Zbl 0125.33202); translation from Dokl. Akad. Nauk SSSR 148, 1034--1037 (1963)
Roĭtberg, Ya. A.; Sheftel’, Z. G. Elliptic equations with discontinuous coefficients. (English. Russian original) Zbl 0133.36002 Sov. Math., Dokl. 3 (1962), 1491-1494 (1963); translation from Dokl. Akad. Nauk SSSR 146, 1275-1278 (1962). Reviewer: M. Cinquini-Cibrario MSC: 35J25 35R05 35D99 PDFBibTeX XML