Tovmasyan, N. E. Some boundary value problems for systems of second-order elliptic equations on a plane. (English. Russian original) Zbl 0196.41002 Sov. Math., Dokl. 6, 322-325 (1965); translation from Dokl. Akad. Nauk SSSR 160, 1275-1278 (1965). PDFBibTeX XMLCite \textit{N. E. Tovmasyan}, Sov. Math., Dokl. 6, 322--325 (1965; Zbl 0196.41002); translation from Dokl. Akad. Nauk SSSR 160, 1275--1278 (1965)
Tovmasyan, N. E. Some boundary value problems for a system of second-order elliptic equations which do not satisfy Lopatinskii’s condition. (English. Russian original) Zbl 0187.35601 Sov. Math., Dokl. 6, 259-263 (1965); translation from Dokl. Akad. Nauk SSSR 160, 1028-1031 (1965). PDFBibTeX XMLCite \textit{N. E. Tovmasyan}, Sov. Math., Dokl. 6, 259--263 (1965; Zbl 0187.35601); translation from Dokl. Akad. Nauk SSSR 160, 1028--1031 (1965)