TY  - JOUR
AU  - M. Ratner
TI  - Rigid reparametrizations and cohomology for horocycle flows.
JO  - Inventiones mathematicae
PY  - 1987
SP  - 341
EP  - 374
VL  - 88
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1987__88_143457/
ID  - IM_1987__88_143457
ER  -