@article{GDZPPN001260073, title = {An order topology for finitely generated free monoids.}, journal = {Semigroup forum}, volume = {38}, year = {1989}, pages = {335-346}, zbl = {0682.06012}, url = {http://dml.mathdoc.fr/item/GDZPPN001260073} }
Gass, M. An order topology for finitely generated free monoids.. Semigroup forum, Tome 38 (1989) pp. 335-346. http://gdmltest.u-ga.fr/item/GDZPPN001260073/