%0 Journal Article
%A Payne,  Victor F.
%A Tejumola,  Haroon Oladipo
%T Existence and nonexistence of periodic solutions of \(n\)-vector differential equations of orders six and seven
%J Electronic journal of differential equations
%D 2012
%V 2012
%U http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a71/
%G en
%F EJDE_2012__2012__a71