%0 Journal Article %A Nowik, Andrzej %T Some topological properties of $\omega$-covering sets %J Czechoslovak Mathematical Journal %D 2000 %P 865-877 %V 50 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_2000__50_4_a13/ %G en %F CMJ_2000__50_4_a13