共 6 条
[1]
Bellman R., 1953, STABILITY THEORY DIF
[3]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[4]
Gronwall TH, 1918, ANN MATH, V20, P292
[6]
RAO MRM, 1970, B AUSTRAL MATH SOC, V3, P9