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@article{SF_1989__39_2_134992, author = {T. Saito}, title = {Product of idempotents in finite full transformation semigroups.}, journal = {Semigroup forum}, pages = {295--310}, publisher = {mathdoc}, volume = {39}, number = {2}, year = {1989}, zbl = {0662.20049}, url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134992/} }
T. Saito. Product of idempotents in finite full transformation semigroups.. Semigroup forum, Tome 39 (1989) no. 2, pp. 295-310. http://geodesic.mathdoc.fr/item/SF_1989__39_2_134992/