@article{JRAM_1991__414_153301,
     author = {P. Zograf},
     title = {A spectral proof of {Rademacher's} conjecture for congruence subgroups of the modular group.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {113},
     publisher = {mathdoc},
     volume = {414},
     year = {1991},
     zbl = {0709.11031},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/JRAM_1991__414_153301/}
}