No semigroup is a finite union of mutants.
Kirn, J.B.
Semigroup forum, Tome 7 (1974), p. 360-361 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1974-01-01
EUDML-ID : urn:eudml:doc:133995 
@article{GDZPPN001249371,
     title = {No semigroup is a finite union of mutants.},
     journal = {Semigroup forum},
     volume = {7},
     year = {1974},
     pages = {360-361},
     language = {en},
     url = {http://dml.mathdoc.fr/item/GDZPPN001249371}
}

Kirn, J.B. No semigroup is a finite union of mutants.. Semigroup forum, Tome 7 (1974) pp. 360-361. http://gdmltest.u-ga.fr/item/GDZPPN001249371/