%0 Journal Article %A Ĺ ulka, Robert %T Nilpotency in semigroups and sublattices of their Booleans %J Mathematica slovaca %D 1987 %P 147-158 %V 37 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1987__37_2_a1/ %G en %F MASLO_1987__37_2_a1