@article{ZNSL_1973_37_a2,
     author = {S. N. Naboko},
     title = {Estimates of the number of geodesics on a~fundamental domain of the modular group},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {43--46},
     publisher = {mathdoc},
     volume = {37},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1973_37_a2/}
}