共 21 条
[1]
AHIEZER NI, 1955, CALCULUS VARIATIONS
[2]
BERGER M, 1970, P S AMS, V18, P10
[5]
Gelfand I., 1963, CALCULUS VARIATIONS
[7]
GORDON WB, 1969, J MATH MECH, V19, P111
[9]
GORDON WB, 1973, ARCH RATION MECH AN, V50, P118