Free subsemigroups of a free semigroup.
Blum, E. K.
Michigan Math. J., Tome 12 (1965) no. 1, p. 179-182 / Harvested from Project Euclid
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Publié le : 1965-06-14
Classification:  20.93 
@article{1028999307,
     author = {Blum, E. K.},
     title = {Free subsemigroups of a free semigroup.},
     journal = {Michigan Math. J.},
     volume = {12},
     number = {1},
     year = {1965},
     pages = { 179-182},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028999307}
}

Blum, E. K. Free subsemigroups of a free semigroup.. Michigan Math. J., Tome 12 (1965) no. 1, pp.  179-182. http://gdmltest.u-ga.fr/item/1028999307/