%0 Journal Article
%A Dinca, George
%A Goeleven, Daniel
%A Paşca, Daniel
%T Duality mapping and the existence of periodic solutions for non-autonomous second order systems.
%J Portugaliae mathematica
%D 2006
%P 47-68
%V 63
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_2006__63_1_52975/
%G en
%F PORMA_2006__63_1_52975