%0 Journal Article %A Ryotaro Sato %T Invariant measures for semigroups %J Studia Mathematica %D 1975 %P 129-134 %V 53 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-53-2-129-134/ %R 10.4064/sm-53-2-129-134 %G en %F 10_4064_sm_53_2_129_134