%0 Journal Article
%A H. Guggenheimer
%T Hill Equations with Coexisting Periodic Solutions, II.
%J Commentarii mathematici Helvetici
%D 1969
%P 381-384
%V 44
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1969__44_139408/
%F CMH_1969__44_139408