@article{GDZPPN00126513X, title = {Left divisibility and word problems in single relation monoids.}, journal = {Semigroup forum}, volume = {53}, year = {1996}, pages = {194-207}, zbl = {0878.20039}, url = {http://dml.mathdoc.fr/item/GDZPPN00126513X} }
Watier, G. Left divisibility and word problems in single relation monoids.. Semigroup forum, Tome 53 (1996) pp. 194-207. http://gdmltest.u-ga.fr/item/GDZPPN00126513X/