On free subsemigroups.
Makar-Limanov, L.
Semigroup forum, Tome 30 (1984), p. 253-254 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1984-01-01
EUDML-ID : urn:eudml:doc:134688 
@article{GDZPPN001256904,
     title = {On free subsemigroups.},
     journal = {Semigroup forum},
     volume = {30},
     year = {1984},
     pages = {253-254},
     zbl = {0552.20043},
     url = {http://dml.mathdoc.fr/item/GDZPPN001256904}
}

Makar-Limanov, L. On free subsemigroups.. Semigroup forum, Tome 30 (1984) pp. 253-254. http://gdmltest.u-ga.fr/item/GDZPPN001256904/