@article{CRMATH_2002__335_5_463_0,
     author = {Bekka, M.Bachir and Curtis, Robyn and de la Harpe, Pierre},
     title = {Familles de graphes expanseurs et paires de {Hecke}},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {463--468},
     publisher = {Elsevier},
     volume = {335},
     number = {5},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02499-8},
     language = {fr},
     url = {http://www.numdam.org/articles/10.1016/S1631-073X(02)02499-8/}
}