TY - JOUR TI - The kernel relation for regular semigroups T3 - Acta scientiarum mathematicarum AU - Petrich Mario PY - 2004 LA - English SN - 0001-6969 UR - http://acta.bibl.u-szeged.hu/16048/1/math_070_numb_003_004_525-544.pdf ER -