%0 Journal Article %A F.A. Bogomolov %T On the Cohomology Ring of a Simple Hyperkähler Manifold (On the Results of Verbitsky). %J Geometric and functional analysis %D 1996 %P 612-618 %V 6 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/GFA_1996__6_1_58240/ %F GFA_1996__6_1_58240