%0 Journal Article %A M. Katetov %T Spaces defined by a~family of centred systems %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1976 %P 111-123 %V 31 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1976_31_5_a9/ %G en %F RM_1976_31_5_a9