Loud, W. S. Behavior of the period of solutions of certain plane autonomous systems near centers. (English) Zbl 0139.04301 Contrib. Differ. Equations 3, 21-36 (1964). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 141 Documents Keywords:ordinary differential equations × Cite Format Result Cite Review PDF