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@article{SF_1987__36_134896, author = {J.W. Hogan}, title = {Hausdorff topologies on the a-bicyclic semigroup.}, journal = {Semigroup forum}, pages = {189--210}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0626.22002}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134896/} }
J.W. Hogan. Hausdorff topologies on the a-bicyclic semigroup.. Semigroup forum, Tome 36 (1987), pp. 189-210. http://geodesic.mathdoc.fr/item/SF_1987__36_134896/