共 16 条
[3]
COURANT R, 1955, ANNALI MATEMATICA PU, V39, P571
[4]
COURANT R, 1962, METHODS MATHEMATICAL, V2
[5]
DIONNE PA, 1962, 117 COLL CNRS EQ DER, P25
[8]
GARDING L, 1964, DIFFERENTIAL ANALYSI, P209
[9]
GARDING L, 1962, 117 COLL INT CNRS EQ, P33