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 
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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/