@article{SF_1992__44_1_135163,
     author = {S.D. Hippisley-Cox},
     title = {Finite point compactifications  of {(N,} +).},
     journal = {Semigroup forum},
     pages = {388--392},
     year = {1992},
     volume = {44},
     number = {1},
     zbl = {0759.22007},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135163/}
}