@article{02206524,
title = {On groups generated by two positive multi-twists: Teichm\"uller curves and Lehmer's number.},
journal = {Geometry \& Topology},
volume = {8},
year = {2004},
pages = {1301-1359},
doi = {10.2140/gt.2004.8.1301},
zbl = {1088.57002},
language = {en},
url = {http://dml.mathdoc.fr/item/02206524}
}
Leininger, Christopher J. On groups generated by two positive multi-twists: Teichmüller curves and Lehmer's number.. Geometry & Topology, Tome 8 (2004) pp. 1301-1359. doi : 10.2140/gt.2004.8.1301. http://gdmltest.u-ga.fr/item/02206524/