%0 Journal Article %A Kossaczký, Igor %T Green's relations and regular elements of transformation semigroups %J Mathematica slovaca %D 1987 %P 159-168 %V 37 %N 2 %U http://geodesic.mathdoc.fr/item/MASLO_1987_37_2_a2/ %G en %F MASLO_1987_37_2_a2