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@article{SF_1972__5_133922, author = {D.W. Hardy and G. Markowsky and R.L. Brandon}, title = {The {Sch\"utzenberger} group of an {H-class} in the semigroup of binary relations.}, journal = {Semigroup forum}, pages = {45--53}, publisher = {mathdoc}, volume = {5}, year = {1972}, zbl = {0259.20056}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133922/} }
D.W. Hardy; G. Markowsky; R.L. Brandon. The Schützenberger group of an H-class in the semigroup of binary relations.. Semigroup forum, Tome 5 (1972), pp. 45-53. http://geodesic.mathdoc.fr/item/SF_1972__5_133922/