Groupes with free 2-generator subsemigroups.
Baumslag, G. ; Roitberg, Y.
Semigroup forum, Tome 24 (1982), p. 135-144 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1982-01-01
EUDML-ID : urn:eudml:doc:134568 
@article{GDZPPN001255703,
     title = {Groupes with free 2-generator subsemigroups.},
     journal = {Semigroup forum},
     volume = {24},
     year = {1982},
     pages = {135-144},
     zbl = {0494.20014},
     url = {http://dml.mathdoc.fr/item/GDZPPN001255703}
}

Baumslag, G.; Roitberg, Y. Groupes with free 2-generator subsemigroups.. Semigroup forum, Tome 24 (1982) pp. 135-144. http://gdmltest.u-ga.fr/item/GDZPPN001255703/