Geodesic
New algebraic invariants for definable subsets in universal algebra
Algebra i logika, Tome 50 (2011) no. 2, pp. 209-230.

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We consider problems of comparing universal algebras in respect of their conditional algebraic geometries. Such comparisons admit of a quite natural algebraic interpretation. Geometric scales for varieties of algebras constructed based on these relations are a natural tool for classifying the varieties of algebras, discriminator varieties in particular.
Keywords: variety of algebras, conditional algebraic geometries, geometric scales of varieties. 
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A. G. Pinus. New algebraic invariants for definable subsets in universal algebra. Algebra i logika, Tome 50 (2011) no. 2, pp. 209-230. http://geodesic.mathdoc.fr/item/AL_2011_50_2_a3/

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