共 50 条
- [4] HYPOELLIPTICITY OF 2ND-ORDER DIFFERENTIAL OPERATORS WITH REAL COEFFICIENTS JOURNAL DE MATHEMATIQUES PURES ET APPLIQUEES, 1976, 55 (01): : 99 - 129
- [6] SMOOTHNESS OF SOLUTIONS EQUATIONS OF THE 2ND-ORDER WITH DISCONTINUOUS COEFFICIENTS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1987, (05): : 11 - 19
- [9] 2ND-ORDER AND 4TH-ORDER STATISTICS OF DOUBLY SCATTERED SPECKLE OPTICA ACTA, 1986, 33 (01): : 79 - 89