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Partially supported by National Science Foundation grant DMS-84-20770 and the Miller Institute for Basic Research, Univ. of Calif., Berkeley
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Ratner, M. Rigid reparametrizations and cohomology for horocycle flows. Invent Math 88, 341–374 (1987). https://doi.org/10.1007/BF01388912
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DOI: https://doi.org/10.1007/BF01388912