@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/