@article{GDZPPN002209292,
title = {Complex hyperbolic ideal triangle groups.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {426},
year = {1992},
pages = {71-86},
zbl = {0739.53055},
url = {http://dml.mathdoc.fr/item/GDZPPN002209292}
}
Goldman, W.M.; Parker, John R. Complex hyperbolic ideal triangle groups.. Journal für die reine und angewandte Mathematik, Tome 426 (1992) pp. 71-86. http://gdmltest.u-ga.fr/item/GDZPPN002209292/