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References:
[1] J. Ježek: The lattice of equational theories. Part I: Modular elements. Czech. Math. J. 31 (1981), 127-153. MR 0604120
[2] J. Ježek: The lattice of equational theories. Part II: The lattice of full sets of terms. Czech. Math. J. 31 (1981), 573-603. MR 0631604
[3] J. Ježek: The lattice of equational theories. Part III: Definability and automorphisms. Czech. Math. J. 32 (1982), 129-164. MR 0646718
[4] J. Ježek: Primitive classes of algebras with unary and nullary operations. Colloq. Math. 20 (1969), 159-179. MR 0246813
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