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Shevrin, L. N.,The Sverdlovsk Tetrad, Semigroup Forum, 4 (1972), 274–280.
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Kim, K.H., Roush, F.W. Orders of subsemigroups of Tn . Semigroup Forum 16, 203 (1978). https://doi.org/10.1007/BF02194631
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DOI: https://doi.org/10.1007/BF02194631