@article{GDZPPN002101718,
title = {Closed geodesics, periods and arithmetic of modular forms.},
journal = {Inventiones mathematicae},
volume = {82},
year = {1985},
pages = {469-480},
zbl = {0566.10018},
url = {http://dml.mathdoc.fr/item/GDZPPN002101718}
}
Katok, Svetlana. Closed geodesics, periods and arithmetic of modular forms.. Inventiones mathematicae, Tome 82 (1985) pp. 469-480. http://gdmltest.u-ga.fr/item/GDZPPN002101718/