TY - JOUR AU - P. Mostert TI - Comments on some Wallace's problems on topological semigroups JO - Colloquium Mathematicum PY - 1963 SP - 221 EP - 225 VL - 10 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-10-2-221-225/ DO - 10.4064/cm-10-2-221-225 LA - en ID - 10_4064_cm_10_2_221_225 ER -