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@article{SF_1982__25_134586, author = {K. Ahre}, title = {On the closure of the bicyclic semigroup.}, journal = {Semigroup forum}, pages = {379--380}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0507.22004}, url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134586/} }
K. Ahre. On the closure of the bicyclic semigroup.. Semigroup forum, Tome 25 (1982), pp. 379-380. http://geodesic.mathdoc.fr/item/SF_1982__25_134586/