%0 Journal Article
%A Zhang, Qiongfen
%A Tang, X. H.
%T Periodic solutions for second order Hamiltonian systems
%J Applications of Mathematics
%D 2012
%P 407-425
%V 57
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.1007/s10492-012-0024-9/
%R 10.1007/s10492-012-0024-9
%G en
%F 10_1007_s10492_012_0024_9