@article{JEMS_2013_15_3_a0,
     author = {Gideon Amir and Omer Angel and B\'alint Vir\'ag},
     title = {Amenability of linear-activity automaton groups},
     journal = {Journal of the European Mathematical Society},
     pages = {705--730},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {2013},
     doi = {10.4171/jems/373},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/373/}
}