Geodesic
The lattice of subvarieties of the biregularization of the variety of Boolean algebras
Discussiones Mathematicae. General Algebra and Applications, Tome 21 (2001) no. 2, pp. 255-268

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Let τ: F → N be a type of algebras, where F is a set of fundamental operation symbols and N is the set of all positive integers. An identity φ ≈ ψ is called biregular if it has the same variables in each of it sides and it has the same fundamental operation symbols in each of it sides. For a variety V of type τ we denote by V_b the biregularization of V, i.e. the variety of type τ defined by all biregular identities from Id(V).
Keywords: subdirectly irreducible algebra, lattice of subvarieties, Boolean algebra, biregular identity 
Płonka, Jerzy. The lattice of subvarieties of the biregularization of the variety of Boolean algebras. Discussiones Mathematicae. General Algebra and Applications, Tome 21 (2001) no. 2, pp. 255-268. http://geodesic.mathdoc.fr/item/DMGAA_2001_21_2_a9/
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