共 8 条
[3]
Krasnoselskii M.A., 1968, OPERATOR TRANSLATION, V19
[4]
RAPP P E, 1975, Mathematical Biosciences, V23, P289, DOI 10.1016/0025-5564(75)90043-7
[5]
ESTIMATION OF FREQUENCY OF NONLINEAR OSCILLATIONS OF A CLASS OF USUAL DIFFERENTIAL EQUATIONS
[J].
ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK,
1974, 54 (02)
:83-90
[8]
Willems J.L., 1970, STABILITY THEORY DYN