@article{JEMS_2009_11_5_a4,
     author = {Jean Bourgain and Alex Gamburd},
     title = {Expansion and random walks in $\mathrm{SL}_d(\mathbb{Z}/p^n \mathbb{Z})$: {II}},
     journal = {Journal of the European Mathematical Society},
     pages = {1057--1103},
     publisher = {mathdoc},
     volume = {11},
     number = {5},
     year = {2009},
     doi = {10.4171/jems/175},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/175/}
}