%0 Journal Article
%A R.G. SWAN
%T Invariant Rational Functions and a Problem of Steenrod.
%J Inventiones mathematicae
%D 1969
%P 148-158
%V 7
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1969__7_141959/
%F IM_1969__7_141959