@article{GDZPPN002223511,
title = {Congruences for Eigenvalues of Hecke Operators on SL2(Z).},
journal = {Manuscripta mathematica},
volume = {35},
year = {1981},
pages = {305-326},
zbl = {0462.10017},
url = {http://dml.mathdoc.fr/item/GDZPPN002223511}
}
Hatada, Kazuyuki. Congruences for Eigenvalues of Hecke Operators on SL2(Z).. Manuscripta mathematica, Tome 35 (1981) pp. 305-326. http://gdmltest.u-ga.fr/item/GDZPPN002223511/