@article{IM_1983__71_142987,
     author = {Kenneth A. Ribet},
     title = {Mod p {Hecke} {Operators} and {Congruences} {Between} {Modular} {Forms.}},
     journal = {Inventiones mathematicae},
     pages = {193--206},
     publisher = {mathdoc},
     volume = {71},
     year = {1983},
     zbl = {0508.10018},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__71_142987/}
}