TY  - JOUR
AU  - G. TSAGAS
TI  - On the Cohomology Ring of a Pinched Riemannian Manifold of Dimension 4.
JO  - Mathematische Annalen
PY  - 1970
SP  - 75
EP  - 80
VL  - 185
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAN_1970__185_161944/
ID  - MAN_1970__185_161944
ER  -