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- [11] PARTIAL HYPOELLIPTICITY OF CLASS OF ELLIPTICAL AND DEGENERATE OPERATORS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1974, 278 (11): : 775 - 778
- [12] INDEX AND REGULARITY THEOREM FOR CLASS OF ELLIPTICAL DEGENERATE OPERATORS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1974, 279 (25): : 873 - 876
- [13] A CERTAIN CLASS OF ORDINARY ELLIPTICAL AND DEGENERATE DIFFERENTIAL OPERATORS PROCEEDINGS OF THE JAPAN ACADEMY, 1968, 44 (09): : 944 - &
- [14] REGULARITY OF A CLASS OF SECOND ORDER DEGENERATE ELLIPTICAL OPERATORS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1969, 268 (20): : 1177 - &
- [16] REGULARITY OF SOLUTIONS OF DEGENERATED ELLIPTICAL OPERATOR COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1973, 276 (12): : 839 - 841
- [17] BOUNDARY PROBLEM FOR A CLASS OF ELLIPTICAL PARABOLIC OPERATORS OF FOURTH ORDERS ATTI DELLA ACCADEMIA NAZIONALE DEI LINCEI RENDICONTI-CLASSE DI SCIENZE FISICHE-MATEMATICHE & NATURALI, 1973, 53 (1-2): : 25 - 28
- [18] CERTAIN PROBLEMS ON LIMITS, ELLIPTICAL AND DEGENERATED COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1970, 271 (20): : 980 - &
- [19] ASYMPTOTIC-BEHAVIOR OF EIGENVALUES FOR A CLASS OF DEGENERATED ELLIPTIC OPERATORS (DIMENSION 2) COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1974, 278 (26): : 1619 - 1622
- [20] ANALYTICAL REGULARITY OF DEGENERATED OPERATORS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1971, 273 (16): : 720 - &