共 50 条
- [21] MAXIMUM HYPOELLIPTICITY FOR POLYNOMIAL OPERATORS OF VECTOR-FIELDS COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1979, 289 (16): : 775 - 778
- [22] APPROXIMATION OF SYSTEM OF VECTOR-FIELDS AND APPLICATIONS TO HYPOELLIPTICITY ARKIV FOR MATEMATIK, 1979, 17 (02): : 237 - 254
- [23] HYPOELLIPTICITY AND NONHYPOELLIPTICITY FOR SUMS OF SQUARES OF COMPLEX VECTOR FIELDS ANALYSIS & PDE, 2013, 6 (02): : 371 - 445
- [24] Normal form of commuting vector fields COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE I-MATHEMATIQUE, 1997, 324 (06): : 665 - 668
- [25] Nambu tensors and commuting vector fields JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 1997, 30 (03): : L27 - L33
- [26] Common Singularities of Commuting Vector Fields BULLETIN OF THE BRAZILIAN MATHEMATICAL SOCIETY, 2024, 55 (02):