@article{GDZPPN001250523, title = {A reduction theorem for complexity of finite semigroups.}, journal = {Semigroup forum}, volume = {11}, year = {1975}, pages = {96-114}, zbl = {0303.20042}, url = {http://dml.mathdoc.fr/item/GDZPPN001250523} }
Tilson, B.; Rhodes, J. A reduction theorem for complexity of finite semigroups.. Semigroup forum, Tome 11 (1975) pp. 96-114. http://gdmltest.u-ga.fr/item/GDZPPN001250523/