Geodesic
Latices of distributive and hyperdistributive varieties of semigroups
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2004), pp. 7-19.

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In the work all distributive and hyperdistributive varieties of semigroups have been found and lattices of subvarieties of them are also described. 
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I. R. Simonyan. Latices of distributive and hyperdistributive varieties of semigroups. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (2004), pp. 7-19. http://geodesic.mathdoc.fr/item/UZERU_2004_2_a1/

[1] T. Kepka, “Varieties of left distributive semigroups.”, Acta universitatis Carolinae - mathematica et phisica, 25:1 (1984), 3–18 | MR | Zbl

[2] Yu. M. Movsisyan, I. R. Simonyan, “Sverkhtozhdestva levoi i pravoi distributivnostei v mnogoobraziyakh polugrupp”, Uchenye zapiski EGU, 2000, no. 1, 28–32

[3] G. Birkgof, Teoriya reshetok, Nauka, M., 1984 | MR