%0 Journal Article
%A Lakrib,  Mustapha
%A Sari,  Tewfik
%T Time averaging for ordinary differential equations and retarded functional differential equations
%J Electronic journal of differential equations
%D 2010
%V 2010
%U http://geodesic.mathdoc.fr/item/EJDE_2010__2010__a218/
%G en
%F EJDE_2010__2010__a218