TY - JOUR AU - S. Lajos TI - A characterization of semigroups which are semilattices of groups JO - Colloquium Mathematicum PY - 1970 SP - 187 EP - 189 VL - 21 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-21-2-187-189/ DO - 10.4064/cm-21-2-187-189 LA - en ID - 10_4064_cm_21_2_187_189 ER -