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- [21] SOME PROPERTIES OF NONNEGATIVE SOLUTIONS OF PARABOLIC DIFFERENTIAL-OPERATORS ANNALI DI MATEMATICA PURA ED APPLICATA, 1981, 128 : 193 - 206
- [23] ON THE SPECTRUM OF A CLASS OF DIFFERENTIAL-OPERATORS AND SOME IMBEDDING THEOREMS MATHEMATICS OF THE USSR-IZVESTIYA, 1980, 15 (01): : 1 - 24
- [25] ON THE RELATION OF THE DIFFERENTIAL-OPERATORS SPECTRUM WITH THE SYMMETRIC COEFFICIENTS AND BOUNDARY-CONDITIONS DOKLADY AKADEMII NAUK SSSR, 1982, 267 (02): : 310 - 313