@article{IM_1986__83_143317,
     author = {J.-P. Labesse and J. Schwermer},
     title = {On liftings and cusp cohomology of arithmetic groups.},
     journal = {Inventiones mathematicae},
     pages = {383--402},
     publisher = {mathdoc},
     volume = {83},
     year = {1986},
     zbl = {0581.10013},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__83_143317/}
}