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Communicated by N. R. Reilly
Research supported by the National Research Council of Canada.
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Edmunds, C.C. On certain finitely based varieties of semigroups. Semigroup Forum 15, 21–39 (1977). https://doi.org/10.1007/BF02195732
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DOI: https://doi.org/10.1007/BF02195732