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References:
[1] JEŽEK: J.: Varieties of algebras with equationally definable zeros. (to appear in Czech. Math. J.). MR 0453610
[2] JEŽEK: J.: EDZ-varieties: The Schreier property and epimorphisms onto. (to appear in Comment. Math. Univ. Carolinae). MR 0409317
[3] MALCEV A. I.: Algebraiczeskie sistemy. Moskva 1930.
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