@article{GDZPPN001265296, title = {Catalan monoids, monoids of local endomorphisms, and their presentations.}, journal = {Semigroup forum}, volume = {53}, year = {1996}, pages = {351-368}, zbl = {0862.20049}, url = {http://dml.mathdoc.fr/item/GDZPPN001265296} }
Solomon, A. Catalan monoids, monoids of local endomorphisms, and their presentations.. Semigroup forum, Tome 53 (1996) pp. 351-368. http://gdmltest.u-ga.fr/item/GDZPPN001265296/