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@article{CMH_1973__48_139559, author = {A. Borel and J-P. Serre}, title = {Corners and {Arithmetic} {Groups}}, journal = {Commentarii mathematici Helvetici}, pages = {436--483}, publisher = {mathdoc}, volume = {48}, year = {1973}, zbl = {0274.22011}, url = {http://geodesic.mathdoc.fr/item/CMH_1973__48_139559/} }
A. Borel; J-P. Serre. Corners and Arithmetic Groups. Commentarii mathematici Helvetici, Tome 48 (1973), pp. 436-483. http://geodesic.mathdoc.fr/item/CMH_1973__48_139559/