Literature cited
A. P. Biryukov, “Semigroups defined by identities,” Dokl. Akad. Nauk SSSR,149, No. 2, 230–232 (1963).
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Translated from Algebra i Logika, Vol. 9, No. 3, pp. 255–273, May–June, 1970.
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Biryukov, A.P. Varieties of idempotent semigroups. Algebr Logic 9, 153–164 (1970). https://doi.org/10.1007/BF02218673
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DOI: https://doi.org/10.1007/BF02218673