The semigroup of nonempty finite subsets of rationals.
Spake, Reuben
International Journal of Mathematics and Mathematical Sciences, Tome 11 (1988), p. 81-86 / Harvested from The Electronic Library of Mathematics
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Publié le : 1988-01-01
DOI : https://doi.org/10.1155/S0161171288000122
EUDML-ID : urn:eudml:doc:46322 
@article{04075403,
     title = {The semigroup of nonempty finite subsets of rationals.},
     journal = {International Journal of Mathematics and Mathematical Sciences},
     volume = {11},
     year = {1988},
     pages = {81-86},
     doi = {10.1155/S0161171288000122},
     zbl = {0658.20037},
     language = {en},
     url = {http://dml.mathdoc.fr/item/04075403}
}

Spake, Reuben. The semigroup of nonempty finite subsets of rationals.. International Journal of Mathematics and Mathematical Sciences, Tome 11 (1988) pp. 81-86. doi : 10.1155/S0161171288000122. http://gdmltest.u-ga.fr/item/04075403/