Orders of subsemigroups of Tn.
F.W. Roush, K.H. Kim (1978)
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F.W. Roush, K.H. Kim (1978)
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N. Hindman, J. Pym (1991)
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K. Todorov (1980)
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T.E. Hall (1982)
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F.P. Pedersen, W.S. Sizer (1980)
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H.D. Junghenn, H. Sedaghat (1991)
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K. Todorov, B. Bijev (1985)
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K.E. Osondu (1977/78)
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P.R. Misra (1996)
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L. Makar-Limanov (1984)
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