@article{05377303, title = {Variation of periods modulo }, journal = {The New York Journal of Mathematics [electronic only]}, volume = {14}, year = {2008}, pages = {601-616}, zbl = {1153.11028}, language = {en}, url = {http://dml.mathdoc.fr/item/05377303} }
Silverman, Joseph H. Variation of periods modulo . The New York Journal of Mathematics [electronic only], Tome 14 (2008) pp. 601-616. http://gdmltest.u-ga.fr/item/05377303/