@article{SM_2004_195_2_a1,
     author = {Ya. B. Vorobets},
     title = {On the uniform distribution of orbits of finitely generated groups and semigroups of plane isometries},
     journal = {Sbornik. Mathematics},
     pages = {163--186},
     year = {2004},
     volume = {195},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2004_195_2_a1/}
}