Mawhin, J. \(L_2\)-estimates and periodic solutions of some nonlinear differential equations. (English) Zbl 0309.34036 Boll. Unione Mat. Ital., IV. Ser. 10, 343-354 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 6 Documents MSC: 34C25 Periodic solutions to ordinary differential equations 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations PDF BibTeX XML Cite \textit{J. Mawhin}, Boll. Unione Mat. Ital., IV. Ser. 10, 343--354 (1974; Zbl 0309.34036) OpenURL