Ahmad, Shair An existence theorem for periodically perturbed conservative systems. (English) Zbl 0294.34029 Mich. Math. J. 20, 385-392 (1973). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 4 ReviewsCited in 29 Documents MSC: 34C25 Periodic solutions to ordinary differential equations PDFBibTeX XMLCite \textit{S. Ahmad}, Mich. Math. J. 20, 385--392 (1973; Zbl 0294.34029) Full Text: DOI