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@article{SF_1991__42_3_135064, author = {F. Halter-Koch}, title = {Arithmetical semigroups defined by congruences.}, journal = {Semigroup forum}, pages = {59--62}, publisher = {mathdoc}, volume = {42}, number = {3}, year = {1991}, zbl = {0734.20027}, url = {http://geodesic.mathdoc.fr/item/SF_1991__42_3_135064/} }
F. Halter-Koch. Arithmetical semigroups defined by congruences.. Semigroup forum, Tome 42 (1991) no. 3, pp. 59-62. http://geodesic.mathdoc.fr/item/SF_1991__42_3_135064/