@article{SF_1996__53_2_135501,
     author = {J.B. Stephen},
     title = {The automorphism group of the graph of an {R} class.},
     journal = {Semigroup forum},
     pages = {387--389},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0861.20057},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135501/}
}