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@article{SF_1984__28_134654, author = {J.W. Hogan}, title = {The a-bicyclic semigroup as a topological semigroup.}, journal = {Semigroup forum}, pages = {265--272}, publisher = {mathdoc}, volume = {28}, year = {1984}, zbl = {0531.22003}, url = {http://geodesic.mathdoc.fr/item/SF_1984__28_134654/} }
J.W. Hogan. The a-bicyclic semigroup as a topological semigroup.. Semigroup forum, Tome 28 (1984), pp. 265-272. http://geodesic.mathdoc.fr/item/SF_1984__28_134654/