%0 Journal Article %A Dorsett, Charles %T New characterizations of regular open sets, semi-regular sets, and extremally disconnectedness %J Mathematica slovaca %D 1995 %P 435-444 %V 45 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1995__45_4_a11/ %G en %F MASLO_1995__45_4_a11