The existence of periodic solutions of an autonomous second order non-linear differential equation
G. J. Butler (1974)
Annales Polonici Mathematici
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G. J. Butler (1974)
Annales Polonici Mathematici
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P. Franklin (1929)
Mathematische Zeitschrift
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Stanisław Sędziwy (1972)
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J. Ligęza (1977)
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Klaus Schmitt (1967)
Mathematische Zeitschrift
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Hans Günzler (1967)
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G. J. Butler, H. I. Freedman (1979)
Annales Polonici Mathematici
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Paul Milnes (1984/85)
Mathematische Zeitschrift
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F. H. Szafraniec (1969)
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S. Sędziwy (1965)
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Vesselin Petkov, Gregori Popov (1995)
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Makay, Géza (2000)
Electronic Journal of Qualitative Theory of Differential Equations [electronic only]
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Takashi Matsuoka (1982/83)
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Radosław Pietkun (2010)
Bulletin of the Polish Academy of Sciences. Mathematics
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The existence of a continuous periodic and almost periodic solutions of the nonlinear integral inclusion is established by means of the generalized Schauder fixed point theorem.