@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/