%0 Journal Article
%A G. TSAGAS
%T On the Cohomology Ring of a Pinched Riemannian Manifold of Dimension 4.
%J Mathematische Annalen
%D 1970
%P 75-80
%V 185
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAN_1970__185_161944/
%F MAN_1970__185_161944