Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MAT_1970_14_4_a1, author = {Ya. Ihara}, title = {On congruence monodromy {problems.~I}}, journal = {Matematika}, pages = {48--77}, publisher = {mathdoc}, volume = {14}, number = {4}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1970_14_4_a1/} }
Ya. Ihara. On congruence monodromy problems.~I. Matematika, Tome 14 (1970) no. 4, pp. 48-77. http://geodesic.mathdoc.fr/item/MAT_1970_14_4_a1/