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@article{SF_1984__30_134716, author = {H. Grassmann}, title = {Characters and the structure of finite semigroups.}, journal = {Semigroup forum}, pages = {211--220}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0533.20040}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134716/} }
H. Grassmann. Characters and the structure of finite semigroups.. Semigroup forum, Tome 30 (1984), pp. 211-220. http://geodesic.mathdoc.fr/item/SF_1984__30_134716/