@article{10_2307_120976,
     author = {Yair N. Minsky},
     title = {The classification of punctured-torus groups},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {2},
     doi = {10.2307/120976},
     zbl = {0939.30034},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/120976/}
}