@article{GDZPPN00210251X, title = {On liftings and cusp cohomology of arithmetic groups.}, journal = {Inventiones mathematicae}, volume = {83}, year = {1986}, pages = {383-402}, zbl = {0581.10013}, url = {http://dml.mathdoc.fr/item/GDZPPN00210251X} }
Labesse, J.-P.; Schwermer, J. On liftings and cusp cohomology of arithmetic groups.. Inventiones mathematicae, Tome 83 (1986) pp. 383-402. http://gdmltest.u-ga.fr/item/GDZPPN00210251X/