@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/