All varieties of orthogroups.
Petrich, M. ; Gerhard, J.A.
Semigroup forum, Tome 31 (1985), p. 311-352 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1985-01-01
EUDML-ID : urn:eudml:doc:134757 
@article{GDZPPN001257617,
     title = {All varieties of orthogroups.},
     journal = {Semigroup forum},
     volume = {31},
     year = {1985},
     pages = {311-352},
     zbl = {0557.20033},
     url = {http://dml.mathdoc.fr/item/GDZPPN001257617}
}

Petrich, M.; Gerhard, J.A. All varieties of orthogroups.. Semigroup forum, Tome 31 (1985) pp. 311-352. http://gdmltest.u-ga.fr/item/GDZPPN001257617/