Geodesic
All varieties of orthogroups.
Semigroup forum, Tome 31 (1985), pp. 311-352.

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Mots-clés : union of groups, idempotents, regular orthogroup, fully invariant congruences, subdirect decompositions, bases for the identities, subvarieties 
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     author = {M. Petrich and J.A. Gerhard},
     title = {All varieties of orthogroups.},
     journal = {Semigroup forum},
     pages = {311--352},
     publisher = {mathdoc},
     volume = {31},
     year = {1985},
     zbl = {0557.20033},
     url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134757/}
}
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M. Petrich; J.A. Gerhard. All varieties of orthogroups.. Semigroup forum, Tome 31 (1985), pp. 311-352. http://geodesic.mathdoc.fr/item/SF_1985__31_134757/