@article{GDZPPN001262971, title = {Adjan's theorem and conjugacy in semigroups.}, journal = {Semigroup forum}, volume = {46}, year = {1993}, pages = {299-304}, zbl = {0797.20043}, url = {http://dml.mathdoc.fr/item/GDZPPN001262971} }
Goldstein, R.; Teymouri, J. Adjan's theorem and conjugacy in semigroups.. Semigroup forum, Tome 46 (1993) pp. 299-304. http://gdmltest.u-ga.fr/item/GDZPPN001262971/