An extension of Ezeilo’s result. (English) Zbl 0268.34045


34C25 Periodic solutions to ordinary differential equations
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
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[1] Ezeilo, J. O. C., A generalization of a theorem of Reissig for a certain third order differential equation, Ann. Mat. Pura Appl., 87, 349-356 (1970) · Zbl 0215.44203
[2] Güssefeldt, G., Zwei Methoden zum Nachweis von periodischen Lösungen bei gewöhnlichen Differentialgleichungen, Math. Nachr., 48, 141-151 (1971) · Zbl 0224.34033
[3] Krasnoselskii, M. A., Topological Methods in the Theory of Nonlinear Integral Equations (1964), Oxford: Pergamon Press, Oxford
[4] Reissig, R., Ein Beschränktheitssatz für gewisse nichtlineare Differentialgleichungen dritter Ordnung, Monatsber. Deutsch. Akad. Wiss. Berlin, 6, 481-484 (1964) · Zbl 0126.10702
[5] Reissig, R.; Sansone, G.; Conti, R., Nichtlineare Differentialgleichungen höherer Ordnung (1969), Roma: Edizioni Cremonese, Roma · Zbl 0172.10801
[6] Villari, G., Soluzioni periodiche di una classe di equazioni differenziali del terz’ordine quasi lineari, Ann. Mat. Pura Appl., 73, 103-110 (1966) · Zbl 0144.11401
[7] G. Villari,Einige Bemerkungen über periodische Lösungen. Vortrag auf der Tagung « Gewöhnliche Differentialgleichungen », Oberwolfach 19.-25.3.1972.
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