%0 Journal Article
%A R. I. Grigorchuk
%T Ergodic theorems for the actions of a~free group and a~free semigroup
%J Matematičeskie zametki
%D 1999
%P 779-783
%V 65
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1999_65_5_a14/
%G ru
%F MZM_1999_65_5_a14