%0 Journal Article %A Anastasia Gudovich %A Mikhail Kamenskii %A Marc Quincampoix %T Existence of periodic solutions of a ordinary differential equation perturbed by a small parameter: An averaging approach %J Comptes Rendus. Mathématique %D 2009 %P 369-374 %V 347 %N 7-8 %I Elsevier %R 10.1016/j.crma.2009.02.012 %G en %F CRMATH_2009__347_7-8_369_0