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Translated from Algebra i Logika, Vol. 21, No. 3, pp. 251–268, May–June, 1982.
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Martynova, T.A. The largest groupoid of varieties of semigroups with zero. Algebra and Logic 21, 169–180 (1982). https://doi.org/10.1007/BF01980627
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DOI: https://doi.org/10.1007/BF01980627