%0 Journal Article %A A. Iwanik %T Weak convergence and weighted averages for groups of operators %J Colloquium Mathematicum %D 1979 %P 241-254 %V 42 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-42-1-241-254/ %R 10.4064/cm-42-1-241-254 %G en %F 10_4064_cm_42_1_241_254