Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1991_49_5_a12, author = {A. Yu. Popov}, title = {Congruence functions}, journal = {Matemati\v{c}eskie zametki}, pages = {97--103}, publisher = {mathdoc}, volume = {49}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1991_49_5_a12/} }
A. Yu. Popov. Congruence functions. Matematičeskie zametki, Tome 49 (1991) no. 5, pp. 97-103. http://geodesic.mathdoc.fr/item/MZM_1991_49_5_a12/