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@article{SF_1975__10_134103, author = {B. Tilson and J. Rhodes}, title = {A reduction theorem for complexity of finite semigroups.}, journal = {Semigroup forum}, pages = {96--114}, publisher = {mathdoc}, volume = {10}, year = {1975}, zbl = {0303.20042}, url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134103/} }
B. Tilson; J. Rhodes. A reduction theorem for complexity of finite semigroups.. Semigroup forum, Tome 10 (1975), pp. 96-114. http://geodesic.mathdoc.fr/item/SF_1975__10_134103/