%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
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EJDE_2012__2012__a71/
%G en
%F EJDE_2012__2012__a71