共 14 条
[1]
BORG G, 1944, ARK MATEMATIK ASTRON, V31
[3]
CARTWRIGHT ML, 1950, CONTRIBUTIONS THEORY
[4]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[6]
LEVINSON N, 1943, J MATH PHYS, V22, P181
[7]
Levinson N., 1943, J MATH PHYS MASS I T, V22, P41
[8]
LIAPOUNOFF A, 1902, MEMOIRS IMPERIA 8 PM, V13, P1
[9]
Liapounoff A. M, 1947, ANN MATH STUDIES, V17
[10]
Loud W. S., 1955, J MATH PHYS, V34, P173, DOI [10.1002/sapm1955341173, DOI 10.1002/SAPM1955341173]