共 50 条
- [1] STRICTLY HYPOELLIPTIC-OPERATORS WITH CONSTANT-COEFFICIENTS [J]. RUSSIAN ACADEMY OF SCIENCES SBORNIK MATHEMATICS, 1993, 75 (01): : 265 - 276
- [3] GEVREY SOLVABILITY OF DIFFERENTIAL-OPERATORS WITH CONSTANT-COEFFICIENTS [J]. COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1984, 299 (02): : 57 - 59
- [4] GEOMETRY OF LOCAL LACUNAE OF HYPERBOLIC OPERATORS WITH CONSTANT-COEFFICIENTS [J]. RUSSIAN ACADEMY OF SCIENCES SBORNIK MATHEMATICS, 1993, 75 (01): : 111 - 123
- [6] A NUMERICAL CHARACTERISTIC OF LINEAR-DIFFERENTIAL OPERATORS WITH CONSTANT-COEFFICIENTS [J]. DOKLADY AKADEMII NAUK SSSR, 1985, 283 (05): : 1068 - 1072