On finitely generated subsemigroups of a free semigroup.
Markov, A.A.
Semigroup forum, Tome 2 (1971), p. 251-258 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1971-01-01
EUDML-ID : urn:eudml:doc:133864 
@article{GDZPPN001247972,
     title = {On finitely generated subsemigroups of a free semigroup.},
     journal = {Semigroup forum},
     volume = {2},
     year = {1971},
     pages = {251-258},
     zbl = {0225.20034},
     url = {http://dml.mathdoc.fr/item/GDZPPN001247972}
}

Markov, A.A. On finitely generated subsemigroups of a free semigroup.. Semigroup forum, Tome 2 (1971) pp. 251-258. http://gdmltest.u-ga.fr/item/GDZPPN001247972/