@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/}
}