%0 Journal Article
%A Joyal,  Pierre
%T Invariance of Poincaré-Lyapunov polynomials under the group of rotations
%J Electronic journal of differential equations
%D 1998
%V 1998
%U http://geodesic.mathdoc.fr/item/EJDE_1998__1998__a4/
%G en
%F EJDE_1998__1998__a4