@article{IM2_1968_2_6_a2,
     author = {I. I. Pyatetskii-Shapiro},
     title = {On reduction modulo a prime of fields of modular functions},
     journal = {Izvestiya. Mathematics },
     pages = {1213--1222},
     publisher = {mathdoc},
     volume = {2},
     number = {6},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_6_a2/}
}