The existence of periodic solutions of an autonomous second order non-linear differential equation
G. J. Butler (1974)
Annales Polonici Mathematici
Similarity:
G. J. Butler (1974)
Annales Polonici Mathematici
Similarity:
Makay, Géza (2000)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Similarity:
J. Ligęza (1977)
Annales Polonici Mathematici
Similarity:
Stanisław Sędziwy (1972)
Annales Polonici Mathematici
Similarity:
G. J. Butler, H. I. Freedman (1979)
Annales Polonici Mathematici
Similarity:
Bahman Mehri (1977)
Archivum Mathematicum
Similarity:
Wang, Yong (2010)
Applied Mathematics E-Notes [electronic only]
Similarity:
S. Invernizzi, F. Zanolin (1979)
Rendiconti del Seminario Matematico della Università di Padova
Similarity:
Wu, Jun, Liu, Yicheng (2006)
Discrete Dynamics in Nature and Society
Similarity:
Ezzinbi, Khalil, Jazar, Mustapha (2004)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
Similarity:
Lin, Wen-Xian (2004)
Mathematica Pannonica
Similarity: