@article{GDZPPN001257285, title = {Compactifications of some hyperspace semigroups.}, journal = {Semigroup forum}, volume = {30}, year = {1984}, pages = {263-282}, zbl = {0537.22004}, url = {http://dml.mathdoc.fr/item/GDZPPN001257285} }
Vasudeva, H.L.; Pym, J.S. Compactifications of some hyperspace semigroups.. Semigroup forum, Tome 30 (1984) pp. 263-282. http://gdmltest.u-ga.fr/item/GDZPPN001257285/