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@article{IM_1987__89_143473, author = {G. Harder}, title = {Eisenstein cohomology of arithmetic groups. {The} case {GL2.}}, journal = {Inventiones mathematicae}, pages = {37--118}, publisher = {mathdoc}, volume = {89}, year = {1987}, zbl = {0629.10023}, url = {http://geodesic.mathdoc.fr/item/IM_1987__89_143473/} }
G. Harder. Eisenstein cohomology of arithmetic groups. The case GL2.. Inventiones mathematicae, Tome 89 (1987), pp. 37-118. http://geodesic.mathdoc.fr/item/IM_1987__89_143473/