@article{GDZPPN001264044,
title = {Solvable word problems in semigroups.},
journal = {Semigroup forum},
volume = {51},
year = {1995},
pages = {243-246},
zbl = {0821.20040},
url = {http://dml.mathdoc.fr/item/GDZPPN001264044}
}
Goldstein, R.Z.; Cummings, P.A. Solvable word problems in semigroups.. Semigroup forum, Tome 51 (1995) pp. 243-246. http://gdmltest.u-ga.fr/item/GDZPPN001264044/