The inverse hull of the free semigroup on a set X.
Knox, N.
Semigroup forum, Tome 16 (1978), p. 345-354 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1978-01-01
EUDML-ID : urn:eudml:doc:134292 
@article{GDZPPN001252836,
     title = {The inverse hull of the free semigroup on a set X.},
     journal = {Semigroup forum},
     volume = {16},
     year = {1978},
     pages = {345-354},
     zbl = {0407.20047},
     url = {http://dml.mathdoc.fr/item/GDZPPN001252836}
}

Knox, N. The inverse hull of the free semigroup on a set X.. Semigroup forum, Tome 16 (1978) pp. 345-354. http://gdmltest.u-ga.fr/item/GDZPPN001252836/