@article{AFST_2010_6_19_1_135_0,
     author = {Thirion, Xavier},
     title = {Groupes de {Ping-Pong} et comptage},
     journal = {Annales de la Facult\'e des sciences de Toulouse : Math\'ematiques},
     pages = {135--190},
     publisher = {Universit\'e Paul Sabatier, Institut de math\'ematiques},
     address = {Toulouse},
     volume = {6e s{\'e}rie, 19},
     number = {1},
     year = {2010},
     doi = {10.5802/afst.1240},
     zbl = {1203.22011},
     mrnumber = {2597785},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/afst.1240/}
}