@article{GDZPPN001256564, title = {The a-bicyclic semigroup as a topological semigroup.}, journal = {Semigroup forum}, volume = {30}, year = {1984}, pages = {265-272}, zbl = {0531.22003}, url = {http://dml.mathdoc.fr/item/GDZPPN001256564} }
Hogan, J.W. The a-bicyclic semigroup as a topological semigroup.. Semigroup forum, Tome 30 (1984) pp. 265-272. http://gdmltest.u-ga.fr/item/GDZPPN001256564/