@article{SF_1984__30_134724,
     author = {H.L. Vasudeva and J.S. Pym},
     title = {Compactifications of some hyperspace semigroups.},
     journal = {Semigroup forum},
     pages = {263--282},
     publisher = {mathdoc},
     volume = {30},
     year = {1984},
     zbl = {0537.22004},
     url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134724/}
}