@article{GDZPPN002104164,
title = {Eisenstein cohomology of arithmetic groups. The case GL2.},
journal = {Inventiones mathematicae},
volume = {88},
year = {1987},
pages = {37-118},
zbl = {0629.10023},
url = {http://dml.mathdoc.fr/item/GDZPPN002104164}
}
Harder, G. Eisenstein cohomology of arithmetic groups. The case GL2.. Inventiones mathematicae, Tome 88 (1987) pp. 37-118. http://gdmltest.u-ga.fr/item/GDZPPN002104164/