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@article{SF_1984__29_134696, author = {W. Williams and Carl Eberhart}, title = {Elementary orthodox semigroups.}, journal = {Semigroup forum}, pages = {351--364}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0547.20053}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134696/} }
W. Williams; Carl Eberhart. Elementary orthodox semigroups.. Semigroup forum, Tome 29 (1984), pp. 351-364. http://geodesic.mathdoc.fr/item/SF_1984__29_134696/