@article{GDZPPN00209424X,
title = {The Horocycle Flow is Mixing of all Degrees.},
journal = {Inventiones mathematicae},
volume = {46},
year = {1978},
pages = {201-210},
zbl = {0395.28012},
url = {http://dml.mathdoc.fr/item/GDZPPN00209424X}
}
Marcus, Brian. The Horocycle Flow is Mixing of all Degrees.. Inventiones mathematicae, Tome 46 (1978) pp. 201-210. http://gdmltest.u-ga.fr/item/GDZPPN00209424X/