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References:
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[2] VOLKOV M. V.: Strukturi mnogoobrasiy algebr. Matem. Sbornik 10 (1979), 60-79; Engl, translation: Lattices of varieties of algebras, Math. USSR, Sbornik, 37 (1980), 53-69.
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[4] SHEVRIN L. N., MARTINOV L. M.: O dostizhimih klassah algebr. Sibirskiy matem. zhurnal 12 (1971), 1363-1381.
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