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@article{SF_1972__5_133930, author = {A.H. Clifford}, title = {The structure of bisimple left unipotent semigroups as ordered pairs.}, journal = {Semigroup forum}, pages = {137--144}, publisher = {mathdoc}, volume = {5}, year = {1972}, zbl = {0264.20045}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133930/} }
A.H. Clifford. The structure of bisimple left unipotent semigroups as ordered pairs.. Semigroup forum, Tome 5 (1972), pp. 137-144. http://geodesic.mathdoc.fr/item/SF_1972__5_133930/