@article{GDZPPN002099004, title = {Mod p Hecke Operators and Congruences Between Modular Forms.}, journal = {Inventiones mathematicae}, volume = {74}, year = {1983}, pages = {193-206}, zbl = {0508.10018}, url = {http://dml.mathdoc.fr/item/GDZPPN002099004} }
Ribet, Kenneth A. Mod p Hecke Operators and Congruences Between Modular Forms.. Inventiones mathematicae, Tome 74 (1983) pp. 193-206. http://gdmltest.u-ga.fr/item/GDZPPN002099004/