Lewis, D. C. On the perturbation of a periodic solution when the variational system has nontrivial periodic solutions. (English) Zbl 0068.30103 J. Ration. Mech. Anal. 4, 795-815 (1955). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents Keywords:Ordinary differential equations PDF BibTeX XML Cite \textit{D. C. Lewis}, J. Ration. Mech. Anal. 4, 795--815 (1955; Zbl 0068.30103) OpenURL