Concerning minimal generating subsets of semigroups
Kelley, R.L. ; Swingle, P.M.
Portugaliae mathematica, Tome 20 (1961), p. 231-250 / Harvested from Portugaliae Mathematica
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Publié le : 1961-01-01
EUDML-ID : urn:eudml:doc:114865 
@article{2375,
     author = {Kelley, R.L. and Swingle, P.M.},
     title = {Concerning minimal generating subsets of semigroups},
     journal = {Portugaliae mathematica},
     volume = {20},
     year = {1961},
     pages = {231-250},
     zbl = {0102.02303},
     mrnumber = {0144317},
     language = {en},
     url = {http://dml.mathdoc.fr/item/2375}
}

Kelley, R.L.; Swingle, P.M. Concerning minimal generating subsets of semigroups. Portugaliae mathematica, Tome 20 (1961) pp. 231-250. http://gdmltest.u-ga.fr/item/2375/