@article{GDZPPN001260693, title = {Sch\"utzenberger groups of some even degree polynomials in S(R).}, journal = {Semigroup forum}, volume = {40}, year = {1990}, pages = {307-328}, zbl = {0704.20049}, url = {http://dml.mathdoc.fr/item/GDZPPN001260693} }
Magill, K.D. jr.; Baird, B.B. Schützenberger groups of some even degree polynomials in S(R).. Semigroup forum, Tome 40 (1990) pp. 307-328. http://gdmltest.u-ga.fr/item/GDZPPN001260693/