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References:
[1] G. GRÄTZER: Universal algebra. D. Van Noatrand, Princeton.
[2] J. JEŽEK: Primitive classes of algebras with unary and nullary operations. Colloquium Math. 20/2 (1969), 159-179. MR 0246813
[3] J. JEŽEK: Principal dual ideals in lattices of primitive classes. Comment. Math. Univ. Carolinae 9 (1968), 533-545. MR 0244131
[4] J. KALICKI: The number of equationally complete classes of equations. Indagationes Math. 17 (1955), 660-662. MR 0074351 | Zbl 0073.24601
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