On some non-rational congruences on free commutative semigroups.
Reis, C.M.
Semigroup forum, Tome 46 (1993), p. 267-284 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1993-01-01
EUDML-ID : urn:eudml:doc:135277 
@article{GDZPPN001262947,
     title = {On some non-rational congruences on free commutative semigroups.},
     journal = {Semigroup forum},
     volume = {46},
     year = {1993},
     pages = {267-284},
     zbl = {0793.20056},
     url = {http://dml.mathdoc.fr/item/GDZPPN001262947}
}

Reis, C.M. On some non-rational congruences on free commutative semigroups.. Semigroup forum, Tome 46 (1993) pp. 267-284. http://gdmltest.u-ga.fr/item/GDZPPN001262947/