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Published in Algebra i Logika, Vol. 9, No. 6, pp. 731–740, November–December, 1970.
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Collins, D.J. A universal semigroup. Algebr Logic 9, 442–446 (1970). https://doi.org/10.1007/BF02219049
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DOI: https://doi.org/10.1007/BF02219049