TY - JOUR AU - Anthony To-Ming Lau TI - Action of topological semigroups, invariant means, and fixed points JO - Studia Mathematica PY - 1972 SP - 139 EP - 156 VL - 43 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-43-2-139-156/ DO - 10.4064/sm-43-2-139-156 LA - en ID - 10_4064_sm_43_2_139_156 ER -