%0 Journal Article %A I. I. Parovichenko %T On the descriptive theory of sets in topological spaces %J Doklady Akademii Nauk %D 1971 %P 1024-1027 %V 196 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1971_196_5_a7/ %G ru %F DAN_1971_196_5_a7