%0 Journal Article %A Simon, Petr %T Covering of a space by nowhere dense sets %J Commentationes Mathematicae Universitatis Carolinae %D 1977 %P 755-761 %V 18 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1977__18_4_a11/ %G en %F CMUC_1977__18_4_a11