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@article{SF_1980__21_134433, author = {C.L. Adair}, title = {A generalization of the bicyclic semigroup.}, journal = {Semigroup forum}, pages = {13--26}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0449.20062}, url = {http://geodesic.mathdoc.fr/item/SF_1980__21_134433/} }
C.L. Adair. A generalization of the bicyclic semigroup.. Semigroup forum, Tome 21 (1980), pp. 13-26. http://geodesic.mathdoc.fr/item/SF_1980__21_134433/