@article{GDZPPN001250736, title = {Sch\"utzenberger groups of some irregular ...-classes.}, journal = {Semigroup forum}, volume = {11}, year = {1975}, pages = {283-314}, zbl = {0305.54042}, url = {http://dml.mathdoc.fr/item/GDZPPN001250736} }
Subbiah, S.; Magill, K.D. Schützenberger groups of some irregular ...-classes.. Semigroup forum, Tome 11 (1975) pp. 283-314. http://gdmltest.u-ga.fr/item/GDZPPN001250736/