Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1975__17_154365, author = {H. Bresinsky}, title = {Symmetric {Semigroups} of {Integers} {Generated} by 4 {Elements.}}, journal = {Manuscripta mathematica}, pages = {205--220}, publisher = {mathdoc}, volume = {17}, year = {1975}, zbl = {0317.10061}, url = {http://geodesic.mathdoc.fr/item/MM2_1975__17_154365/} }
H. Bresinsky. Symmetric Semigroups of Integers Generated by 4 Elements.. Manuscripta mathematica, Tome 17 (1975), pp. 205-220. http://geodesic.mathdoc.fr/item/MM2_1975__17_154365/