共 13 条
[1]
Bellman R., 1953, STABILITY THEORY DIF
[2]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[3]
EPSTEIN IJ, 1962, P AM MATH SOC, V13, P690
[4]
Hale J. K., 1963, OSCILLATIONS NONLINE
[5]
LAITOCH M, 1956, MATH REV, V17, P612
[6]
LAITOCH M, 1955, CZECH MATH J, V5, P164
[7]
LASALLE JP, 1963, INT S NONLINEAR D ED, P99
[9]
LEWIS DC, 1963, INT S NONLINEAR DIFF, P99
[10]
MARAVCIK J, 1967, MATH REV, V33, P329