TY - JOUR AU - ALFRED TARSKI TI - Remarks on direct products of commutative semigroups JO - Mathematica Scandinavica PY - 1957 SP - 218 EP - 223 VL - 5 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MS2_1957__5_165660/ ID - MS2_1957__5_165660 ER -