TY - JOUR AU - A. I. Bufetov TI - Operator Ergodic Theorems for Actions of Free Semigroups and Groups JO - Funkcionalʹnyj analiz i ego priloženiâ PY - 2000 SP - 1 EP - 17 VL - 34 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/FAA_2000_34_4_a0/ LA - ru ID - FAA_2000_34_4_a0 ER -