@article{1102352057, author = {Maclachlan, C.}, title = {Triangle subgroups of hyperbolic tetrahedral groups.}, journal = {Pacific J. Math.}, volume = {176}, number = {2}, year = {1996}, pages = { 195-203}, language = {en}, url = {http://dml.mathdoc.fr/item/1102352057} }
Maclachlan, C. Triangle subgroups of hyperbolic tetrahedral groups.. Pacific J. Math., Tome 176 (1996) no. 2, pp. 195-203. http://gdmltest.u-ga.fr/item/1102352057/