%0 Journal Article %A I. P. Egorov %T Riemannian spaces of the first three lacunary types in the geometric sense %J Doklady Akademii Nauk %D 1963 %P 730-732 %V 150 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1963_150_4_a5/ %G ru %F DAN_1963_150_4_a5