@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/