@article{GDZPPN001248693, title = {The structure of bisimple left unipotent semigroups as ordered pairs.}, journal = {Semigroup forum}, volume = {4}, year = {1972}, pages = {137-144}, zbl = {0264.20045}, url = {http://dml.mathdoc.fr/item/GDZPPN001248693} }
Clifford, A.H. The structure of bisimple left unipotent semigroups as ordered pairs.. Semigroup forum, Tome 4 (1972) pp. 137-144. http://gdmltest.u-ga.fr/item/GDZPPN001248693/