@article{GDZPPN001253131, title = {The Maak compactification of a dense subsemigroup.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {261-266}, zbl = {0416.22003}, url = {http://dml.mathdoc.fr/item/GDZPPN001253131} }
Junghenn, H.D. The Maak compactification of a dense subsemigroup.. Semigroup forum, Tome 18 (1979) pp. 261-266. http://gdmltest.u-ga.fr/item/GDZPPN001253131/