@article{GDZPPN001260049, title = {Product of idempotents in finite full transformation semigroups.}, journal = {Semigroup forum}, volume = {38}, year = {1989}, pages = {295-310}, zbl = {0662.20049}, url = {http://dml.mathdoc.fr/item/GDZPPN001260049} }
Saito, T. Product of idempotents in finite full transformation semigroups.. Semigroup forum, Tome 38 (1989) pp. 295-310. http://gdmltest.u-ga.fr/item/GDZPPN001260049/