@article{GDZPPN002327651, title = {Reduction Theory for Fuchsian Groups.}, journal = {Mathematische Annalen}, volume = {270}, year = {1985}, pages = {461-470}, zbl = {0561.30036}, url = {http://dml.mathdoc.fr/item/GDZPPN002327651} }
Katok, Svetlana. Reduction Theory for Fuchsian Groups.. Mathematische Annalen, Tome 270 (1985) pp. 461-470. http://gdmltest.u-ga.fr/item/GDZPPN002327651/