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@article{DAN_1961_136_4_a2, author = {B. M. Gurevich}, title = {The entropy of horocycle flows}, journal = {Doklady Akademii Nauk}, pages = {768--770}, publisher = {mathdoc}, volume = {136}, number = {4}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_136_4_a2/} }
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/