@article{MM2_1981__34_154778,
     author = {Kazuyuki Hatada},
     title = {Congruences for {Eigenvalues} of {Hecke} {Operators} on {SL2(Z).}},
     journal = {Manuscripta mathematica},
     pages = {305--326},
     publisher = {mathdoc},
     volume = {34},
     year = {1981},
     zbl = {0462.10017},
     url = {http://geodesic.mathdoc.fr/item/MM2_1981__34_154778/}
}