Free groups and semigroups in ßN.
Hindman, N. ; Pym, J.
Semigroup forum, Tome 30 (1984), p. 177-194 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1984-01-01
EUDML-ID : urn:eudml:doc:134714 
@article{GDZPPN001257188,
     title = {Free groups and semigroups in  \ss N.},
     journal = {Semigroup forum},
     volume = {30},
     year = {1984},
     pages = {177-194},
     zbl = {0536.22005},
     url = {http://dml.mathdoc.fr/item/GDZPPN001257188}
}

Hindman, N.; Pym, J. Free groups and semigroups in  ßN.. Semigroup forum, Tome 30 (1984) pp. 177-194. http://gdmltest.u-ga.fr/item/GDZPPN001257188/