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@article{SF_1984__30_134728, author = {J.A. Hildebrant}, title = {The translational degree of a semigroup.}, journal = {Semigroup forum}, pages = {331--350}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0536.20039}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134728/} }
J.A. Hildebrant. The translational degree of a semigroup.. Semigroup forum, Tome 30 (1984), pp. 331-350. http://geodesic.mathdoc.fr/item/SF_1984__30_134728/