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@article{SF_1977__14_186356, author = {C.H. Houghton}, title = {Completely 0-simple semigroups and their associated graphs and groups.}, journal = {Semigroup forum}, pages = {41--68}, publisher = {mathdoc}, volume = {14}, year = {1977}, zbl = {0358.20071}, url = {http://geodesic.mathdoc.fr/item/SF_1977__14_186356/} }
C.H. Houghton. Completely 0-simple semigroups and their associated graphs and groups.. Semigroup forum, Tome 14 (1977), pp. 41-68. http://geodesic.mathdoc.fr/item/SF_1977__14_186356/