共 5 条
[1]
CARTAN H, 1971, DIFFERENTIAL CALCULU
[2]
NOTE ON SCHWINGER VARIATIONAL METHOD
[J].
PROGRESS OF THEORETICAL PHYSICS,
1951, 6 (03)
:295-305
[4]
SCHWINGER J, 1947, PHYS REV, V72, P742
[5]
SHARMA CS, IN PRESS