%0 Journal Article
%A Petzeltová, Hana
%T Periodic solutions of the equation $u_{tt}+u_{xxxx}=\varepsilon f(\cdot,\cdot,u,u_t)$
%J Czechoslovak Mathematical Journal
%D 1973
%P 269-285
%V 23
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1973.101166/
%R 10.21136/CMJ.1973.101166
%G en
%F 10_21136_CMJ_1973_101166