%0 Journal Article %A V. B. Marenich %T The structure of open manifolds of nonnegative curvature %J Doklady Akademii Nauk %D 1989 %P 1311-1314 %V 305 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1989_305_6_a5/ %G ru %F DAN_1989_305_6_a5