%0 Journal Article %A Anthony To-Ming Lau %T Action of topological semigroups, invariant means, and fixed points %J Studia Mathematica %D 1972 %P 139-156 %V 43 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-43-2-139-156/ %R 10.4064/sm-43-2-139-156 %G en %F 10_4064_sm_43_2_139_156