共 6 条
[1]
Coddington E. A., 1955, THEORY ORDINARY DIFF
[2]
Coppel W. A., 1965, STABILITY ASYMPTOTIC
[3]
Jackson D, 1921, T AM MATH SOC, V22, P117
[4]
McEwen WH, 1931, T AM MATH SOC, V33, P979
[5]
OBERG EN, 1935, B AM MATH SOC, V41, P276
[6]
STEIN FM, 1955, THESIS STATE U IOWA, P1