@article{SF_1990__41_2_135056,
     author = {K.D. jr. Magill and B.B. Baird},
     title = {Sch\"utzenberger groups of some even degree polynomials in {S(R).}},
     journal = {Semigroup forum},
     pages = {307--328},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1990},
     zbl = {0704.20049},
     url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135056/}
}