@article{TRSPY_2000_231_a4,
     author = {R. I. Grigorchuk},
     title = {An {Ergodic} {Theorem} for the {Action} of {a~Free} {Semigroup}},
     journal = {Informatics and Automation},
     pages = {119--133},
     publisher = {mathdoc},
     volume = {231},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2000_231_a4/}
}