%0 Journal Article %A V. N. Abdullin %T A classification of the four-dimensional Riemannian spaces that admit fields of covariantly constant bivectors %J Učënye zapiski Kazanskogo universiteta. Seriâ Fiziko-matematičeskie nauki %D 1970 %P 5-21 %V 129 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/UZKU_1970_129_6_a1/ %G ru %F UZKU_1970_129_6_a1