@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/