A non regular perfect semigroup.
Bulman-Fleming, S. ; McDowell, K.
Semigroup forum, Tome 33 (1986), p. 119-122 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1986-01-01
EUDML-ID : urn:eudml:doc:134860 
@article{GDZPPN001258680,
     title = {A non regular perfect semigroup.},
     journal = {Semigroup forum},
     volume = {33},
     year = {1986},
     pages = {119-122},
     zbl = {0615.20041},
     url = {http://dml.mathdoc.fr/item/GDZPPN001258680}
}

Bulman-Fleming, S.; McDowell, K. A non regular perfect semigroup.. Semigroup forum, Tome 33 (1986) pp. 119-122. http://gdmltest.u-ga.fr/item/GDZPPN001258680/