@article{1077228217, author = {Vatsal, V.}, title = {Canonical periods and congruence formulae}, journal = {Duke Math. J.}, volume = {100}, number = {1}, year = {1999}, pages = { 397-419}, language = {en}, url = {http://dml.mathdoc.fr/item/1077228217} }
Vatsal, V. Canonical periods and congruence formulae. Duke Math. J., Tome 100 (1999) no. 1, pp. 397-419. http://gdmltest.u-ga.fr/item/1077228217/