@article{GDZPPN001259059,
title = {Hausdorff topologies on the a-bicyclic semigroup.},
journal = {Semigroup forum},
volume = {36},
year = {1987},
pages = {189-210},
zbl = {0626.22002},
url = {http://dml.mathdoc.fr/item/GDZPPN001259059}
}
Hogan, J.W. Hausdorff topologies on the a-bicyclic semigroup.. Semigroup forum, Tome 36 (1987) pp. 189-210. http://gdmltest.u-ga.fr/item/GDZPPN001259059/