%0 Journal Article
%A Birtea, Petre
%A Puta, Mircea
%A Tudoran, Răzvan Micu
%T Periodic orbits in the case of a zero eigenvalue
%J Comptes Rendus. Mathématique
%D 2007
%P 779-784
%V 344
%N 12
%I Elsevier
%U http://www.numdam.org/articles/10.1016/j.crma.2007.05.003/
%R 10.1016/j.crma.2007.05.003
%G en
%F CRMATH_2007__344_12_779_0