@article{GDZPPN002324733, title = {Torsion in Cocompact Lattices in Coverings of Spin (2,n).}, journal = {Mathematische Annalen}, volume = {268}, year = {1984}, pages = {403-420}, zbl = {0513.22008}, url = {http://dml.mathdoc.fr/item/GDZPPN002324733} }
Raghunathan, M.S. Torsion in Cocompact Lattices in Coverings of Spin (2,n).. Mathematische Annalen, Tome 268 (1984) pp. 403-420. http://gdmltest.u-ga.fr/item/GDZPPN002324733/