%0 Journal Article %A Phan Đìni Diêu %T On closed and open sets in constructive topological spaces %J Informatics and Automation %D 1967 %P 250-256 %V 93 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1967_93_a12/ %G ru %F TRSPY_1967_93_a12