@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/