@article{JEMS_2011_13_5_a3,
     author = {Alexander Lubotzky},
     title = {Finite simple groups of {Lie} type as expanders},
     journal = {Journal of the European Mathematical Society},
     pages = {1331--1341},
     publisher = {mathdoc},
     volume = {13},
     number = {5},
     year = {2011},
     doi = {10.4171/jems/282},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/282/}
}