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Communicated by N.R. Reilly
Research supported by the Natural Sciences and Engineering Research Council of Canada.
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Edmunds, C.C. Varieties generated by semigroups of order four. Semigroup Forum 21, 67–81 (1980). https://doi.org/10.1007/BF02572537
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DOI: https://doi.org/10.1007/BF02572537