The lattice of R-unipotent congruences on a regular semigroup.
Gomes, G.M.S.
Semigroup forum, Tome 33 (1986), p. 159-174 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1986-01-01
EUDML-ID : urn:eudml:doc:134801 
@article{GDZPPN001258087,
     title = {The lattice of R-unipotent congruences on a regular semigroup.},
     journal = {Semigroup forum},
     volume = {33},
     year = {1986},
     pages = {159-174},
     zbl = {0582.20049},
     url = {http://dml.mathdoc.fr/item/GDZPPN001258087}
}

Gomes, G.M.S. The lattice of R-unipotent congruences on a regular semigroup.. Semigroup forum, Tome 33 (1986) pp. 159-174. http://gdmltest.u-ga.fr/item/GDZPPN001258087/