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- [24] BOUNDARY VALUE PROBLEMS FOR SOME CLASSES OF DEGENERATING ELLIPTIC OPERATORS DOKLADY AKADEMII NAUK SSSR, 1971, 197 (03): : 535 - &
- [27] ON THEORY OF BOUNDARY VALUE PROBLEMS FOR GENERAL ELLIPTIC SYSTEMS DOKLADY AKADEMII NAUK SSSR, 1963, 148 (03): : 489 - &
- [28] THE BOUNDARY VALUE PROBLEMS FOR GENERAL PARTIAL DIFFERENTIAL OPERATORS DOKLADY AKADEMII NAUK SSSR, 1958, 122 (06): : 959 - 962