Geodesic
The entropy of horocycle flows
Doklady Akademii Nauk, Tome 136 (1961) no. 4, pp. 768-770 
B. M. Gurevich. The entropy of horocycle flows. Doklady Akademii Nauk, Tome 136 (1961) no. 4, pp. 768-770. http://geodesic.mathdoc.fr/item/DAN_1961_136_4_a2/
@article{DAN_1961_136_4_a2,
     author = {B. M. Gurevich},
     title = {The entropy of horocycle flows},
     journal = {Doklady Akademii Nauk},
     pages = {768--770},
     year = {1961},
     volume = {136},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_4_a2/}
}
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