References
Magill, Jr., K. D.,A survey of semigroups of continuous selfmaps, Semigroup Forum 11 (3) (1975/76) 189–282.
— and S. Subbiah,Semigroups with exactly three regular D-classes, Semigroup Forum 17 (3) (1979) 279–281.
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Magill, K.D., Subbiah, S. Another semigroup characterization of the simple closed curve. Semigroup Forum 20, 89–90 (1980). https://doi.org/10.1007/BF02572671
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DOI: https://doi.org/10.1007/BF02572671