@article{GDZPPN002069725,
title = {Triangle subgroups of Kleinian groups.},
journal = {Commentarii mathematici Helvetici},
volume = {71},
year = {1996},
pages = {339-361},
zbl = {0865.30059},
url = {http://dml.mathdoc.fr/item/GDZPPN002069725}
}
Martin, Gaven J. Triangle subgroups of Kleinian groups.. Commentarii mathematici Helvetici, Tome 71 (1996) pp. 339-361. http://gdmltest.u-ga.fr/item/GDZPPN002069725/