@article{CRMATH_2016__354_2_131_0,
     author = {Jean Bourgain and Alexander Gamburd and Peter Sarnak},
     title = {Markoff triples and strong approximation},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {131--135},
     publisher = {Elsevier},
     volume = {354},
     number = {2},
     year = {2016},
     doi = {10.1016/j.crma.2015.12.006},
     language = {en},
}