%0 Journal Article
%A Mawhin, Jean
%T A simple proof of a semi-Fredholm principle for periodically forced systems with homogeneous nonlinearities
%J Archivum mathematicum
%D 1989
%P 235-238
%V 25
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/ARM_1989__25_4_a5/
%G en
%F ARM_1989__25_4_a5