@article{BSMF_1986__114__431_0,
     author = {Pollicott, Mark},
     title = {Distribution of closed geodesics on the modular surface and quadratic irrationals},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {431--446},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {114},
     year = {1986},
     doi = {10.24033/bsmf.2064},
     mrnumber = {88j:58102},
     zbl = {0624.58019},
     language = {en},
     url = {http://www.numdam.org/articles/10.24033/bsmf.2064/}
}