@article{SF_1977__15_134268,
     author = {J. F. Bergland and H.D. Junghenn and P. Milnes},
     title = {Universal mapping properties of semigroup compactifications.},
     journal = {Semigroup forum},
     pages = {375--386},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0391.22005},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__15_134268/}
}