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@article{SF_1991__43_3_135113, author = {A. Foster}, title = {Another semigroup of complexity n-1.}, journal = {Semigroup forum}, pages = {257--259}, publisher = {mathdoc}, volume = {43}, number = {3}, year = {1991}, zbl = {0737.20028}, url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135113/} }
A. Foster. Another semigroup of complexity n-1.. Semigroup forum, Tome 43 (1991) no. 3, pp. 257-259. http://geodesic.mathdoc.fr/item/SF_1991__43_3_135113/