Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{SF_1975__10_134099, author = {H. Hamilton}, title = {Permutability of congruences on commutative semigroups.}, journal = {Semigroup forum}, pages = {55--66}, publisher = {mathdoc}, volume = {10}, year = {1975}, zbl = {0298.20061}, url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134099/} }
H. Hamilton. Permutability of congruences on commutative semigroups.. Semigroup forum, Tome 10 (1975), pp. 55-66. http://geodesic.mathdoc.fr/item/SF_1975__10_134099/