The lattice of semigroup varieties.
Evans, T.
Semigroup forum, Tome 2 (1971), p. 1-43 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1971-01-01
EUDML-ID : urn:eudml:doc:133807 
@article{GDZPPN001247360,
     title = {The lattice of semigroup varieties.},
     journal = {Semigroup forum},
     volume = {2},
     year = {1971},
     pages = {1-43},
     zbl = {0225.20043},
     url = {http://dml.mathdoc.fr/item/GDZPPN001247360}
}

Evans, T. The lattice of semigroup varieties.. Semigroup forum, Tome 2 (1971) pp. 1-43. http://gdmltest.u-ga.fr/item/GDZPPN001247360/