共 50 条
- [1] EXISTENCE OF OSCILLATORY SOLUTIONS FOR A NONLINEAR DIFFERENTIAL EQUATION [J]. NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1971, 18 (02): : 366 - &
- [6] PERIODIC SOLUTIONS OF A NONLINEAR DIFFERENTIAL EQUATION WITH PERIODIC COEFFICIENTS [J]. ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, 1970, 50 (1-4): : T23 - &
- [9] PERIODIC SOLUTIONS OF THE NONLINEAR GENERALIZED DIRAC EQUATION [J]. SOVIET PHYSICS JETP-USSR, 1958, 7 (06): : 1093 - 1096