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- [41] HYPOELLIPTICITY OF QUASILINEAR ELLIPTIC-OPERATORS DOKLADI NA BOLGARSKATA AKADEMIYA NA NAUKITE, 1982, 35 (12): : 1627 - 1630
- [44] IMPROVED ASYMPTOTIC-BEHAVIOR OF THE SPECTRUM OF GLOBALLY ELLIPTIC-OPERATORS INR COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1981, 292 (06): : 363 - 366