共 12 条
[1]
Brown R.S, 1958, THESIS U CALIFORNIA
[3]
ON THE STABILITY OF CERTAIN 2ND ORDER DIFFERENTIAL EQUATIONS
[J].
JOURNAL OF THE SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS,
1964, 12 (01)
:58-59
[4]
KAPLAN W, 1958, ORDINARY DIFFERENTIA, P178
[5]
LEFSCHETZ S, 1957, PURE APPLIED MATHEMA, P228
[8]
McHarg E. A., 1947, J LOND MATH SOC, V22, P83
[9]
Minorsky N., 1962, NONLINEAR OSCIL
[10]
Prince R. G. H., 1960, P INT S DIST I CHEM, P177