%0 Journal Article
%A J. W. Heidel
%T Periodic solutions of $x" + f(x)x'^{2n} + g(x) = 0$ with arbitrarily large period
%J Annales Polonici Mathematici
%D 1970
%P 343-348
%V 24
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-24-3-343-348/
%R 10.4064/ap-24-3-343-348
%G en
%F 10_4064_ap_24_3_343_348