共 6 条
[1]
AGMON S, 1962 PAR C PART DIFF
[2]
FRIEDRICHS KO, 1967, P S PUR MATH, V10
[3]
HERSH R, 1963, J MATH MECH, V12, P317
[4]
Kato T., 1966, PERTURBATION THEORY, V132
[5]
KREISS HO, 1963, MATH SCAND, V13, P109