@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/