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@article{MAN_1970__185_161944, author = {G. TSAGAS}, title = {On the {Cohomology} {Ring} of a {Pinched} {Riemannian} {Manifold} of {Dimension} 4.}, journal = {Mathematische Annalen}, pages = {75--80}, publisher = {mathdoc}, volume = {185}, year = {1970}, zbl = {0181.24404}, url = {http://geodesic.mathdoc.fr/item/MAN_1970__185_161944/} }
G. TSAGAS. On the Cohomology Ring of a Pinched Riemannian Manifold of Dimension 4.. Mathematische Annalen, Tome 185 (1970), pp. 75-80. http://geodesic.mathdoc.fr/item/MAN_1970__185_161944/