%0 Journal Article
%A W. R. Utz
%T Periodic solutions of $x" + f(x)x'^m + g(x) = 0$
%J Annales Polonici Mathematici
%D 1970
%P 327-330
%V 24
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-24-3-327-330/
%R 10.4064/ap-24-3-327-330
%G en
%F 10_4064_ap_24_3_327_330