@article{1077305667,
author = {Koblitz, Neal},
title = {Congruences for periods of modular forms},
journal = {Duke Math. J.},
volume = {54},
number = {1},
year = {1987},
pages = { 361-373},
language = {en},
url = {http://dml.mathdoc.fr/item/1077305667}
}
Koblitz, Neal. Congruences for periods of modular forms. Duke Math. J., Tome 54 (1987) no. 1, pp. 361-373. http://gdmltest.u-ga.fr/item/1077305667/