@article{GDZPPN002336979,
title = {Geometry of quotient spaces of SO (3) SL (3, R) by congruence subgroups.},
journal = {Mathematische Annalen},
volume = {293},
year = {1992},
pages = {443-468},
zbl = {0769.53033},
url = {http://dml.mathdoc.fr/item/GDZPPN002336979}
}
Hattori, Toshiaki. Geometry of quotient spaces of SO (3) SL (3, R) by congruence subgroups.. Mathematische Annalen, Tome 293 (1992) pp. 443-468. http://gdmltest.u-ga.fr/item/GDZPPN002336979/