%0 Journal Article
%A Bebernes, J.
%A Schmitt, K.
%T An existence theorem for periodic boundary value problems for systems of second order diffferential equations
%J Archivum mathematicum
%D 1972
%P 173-176
%V 08
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ARM_1972__8_4_a2/
%G en
%F ARM_1972__8_4_a2