%0 Journal Article %A I. V. Dolgachev %T On the F.~Severi hypothesis concerning simply connected algebraic surfaces %J Doklady Akademii Nauk %D 1966 %P 249-252 %V 170 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1966_170_2_a3/ %G ru %F DAN_1966_170_2_a3