%0 Journal Article %A Fabrici, Imrich %T Semigroups containing covered one-sided ideals %J Mathematica slovaca %D 1981 %P 225-231 %V 31 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1981__31_3_a0/ %G en %F MASLO_1981__31_3_a0