@article{01247715, title = {Platonic triangles of groups.}, journal = {Experimental Mathematics}, volume = {7}, year = {1998}, pages = {191-219}, doi = {10.1080/10586458.1998.10504369}, zbl = {0959.20039}, language = {en}, url = {http://dml.mathdoc.fr/item/01247715} }
Alperin, Roger C. Platonic triangles of groups.. Experimental Mathematics, Tome 7 (1998) pp. 191-219. doi : 10.1080/10586458.1998.10504369. http://gdmltest.u-ga.fr/item/01247715/