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@article{IM_1987__88_143457, author = {M. Ratner}, title = {Rigid reparametrizations and cohomology for horocycle flows.}, journal = {Inventiones mathematicae}, pages = {341--374}, publisher = {mathdoc}, volume = {88}, year = {1987}, zbl = {0697.58046}, url = {http://geodesic.mathdoc.fr/item/IM_1987__88_143457/} }
M. Ratner. Rigid reparametrizations and cohomology for horocycle flows.. Inventiones mathematicae, Tome 88 (1987), pp. 341-374. http://geodesic.mathdoc.fr/item/IM_1987__88_143457/