@article{GDZPPN001258818, title = {Maximal subsemilattices of the full transformation semigroup.}, journal = {Semigroup forum}, volume = {33}, year = {1986}, pages = {245-250}, zbl = {0613.20042}, url = {http://dml.mathdoc.fr/item/GDZPPN001258818} }
Crvenkovic, S.; Kunze, M. Maximal subsemilattices of the full transformation semigroup.. Semigroup forum, Tome 33 (1986) pp. 245-250. http://gdmltest.u-ga.fr/item/GDZPPN001258818/