@article{02096245, title = {Belyi's theorem revisited.}, journal = {Beitr\"age zur Algebra und Geometrie}, volume = {45}, year = {2004}, pages = {253-265}, zbl = {1060.14040}, language = {en}, url = {http://dml.mathdoc.fr/item/02096245} }
Köck, Bernhard. Belyi's theorem revisited.. Beiträge zur Algebra und Geometrie, Tome 45 (2004) pp. 253-265. http://gdmltest.u-ga.fr/item/02096245/