%0 Journal Article
%A Dłotko, Tadeusz
%T Periodic solutions of some second order differential systems
%J Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
%D 1993
%P 35-41
%V 32
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AUPO_1993__32_1_a4/
%G en
%F AUPO_1993__32_1_a4