%0 Journal Article %A Fabrici, Imrich %T Two-Sided Bases of Semigroups %J Mathematica slovaca %D 1975 %P 173-178 %V 25 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1975__25_2_a10/ %G en %F MASLO_1975__25_2_a10