%0 Journal Article %A V. G. Lemlein %T The curvature tensor and certain types of spaces of symmetric, nearly symplectic connectivity %J Doklady Akademii Nauk %D 1957 %P 755-758 %V 117 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1957_117_5_a6/ %G ru %F DAN_1957_117_5_a6