@article{10_1090_S0894_0347_04_00467_9,
     author = {Ab\'ert, Mikl\'os and Vir\'ag, B\'alint},
     title = {Dimension and randomness in groups acting on rooted trees},
     journal = {Journal of the American Mathematical Society},
     pages = {157--192},
     year = {2005},
     volume = {18},
     number = {1},
     doi = {10.1090/S0894-0347-04-00467-9},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-04-00467-9/}
}