@article{CRMATH_2006__343_3_155_0,
     author = {Bourgain, Jean and Gamburd, Alex and Sarnak, Peter},
     title = {Sieving and expanders},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {155--159},
     publisher = {Elsevier},
     volume = {343},
     number = {3},
     year = {2006},
     doi = {10.1016/j.crma.2006.05.023},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2006.05.023/}
}