@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/