@article{SF_1979__17_134321,
     author = {H.D. Junghenn},
     title = {The {Maak} compactification of a dense subsemigroup.},
     journal = {Semigroup forum},
     pages = {261--266},
     publisher = {mathdoc},
     volume = {17},
     year = {1979},
     zbl = {0416.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134321/}
}