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@article{BAG_1985__19_138291, author = {Hubert Grassmann}, title = {On characters and characteristic polynomials of transformation semigroups}, journal = {Beitr\"age zur Algebra und Geometrie}, pages = {51--58}, publisher = {mathdoc}, volume = {19}, year = {1985}, zbl = {0596.20057}, url = {http://geodesic.mathdoc.fr/item/BAG_1985__19_138291/} }
Hubert Grassmann. On characters and characteristic polynomials of transformation semigroups. Beiträge zur Algebra und Geometrie, Tome 19 (1985), pp. 51-58. http://geodesic.mathdoc.fr/item/BAG_1985__19_138291/