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[1] Clifford A. H., Preston G. B.: The Algebraic Theory of Semigroups. Vol. I, Mathematical Surveys, 7, Amer. Math. Soc. ,1961. MR 0132791 | Zbl 0111.03403
[2] Hofmann K. H., Mostert P. S.: Elements of Compact Semigroups. Charles E. Merrill, Inc. Columbus, Ohio, 1966. MR 0209387 | Zbl 0161.01901
[3] Mc Char en J. D.: Maximal Elements in Compact Semigroups. Dissertation, Louisiana State University, 1969.
[4] Wallace A. D.: Project Mob. University of Florida, 1965.
[5] Whyburn G. T.: Analytic Topology. Amer. Math. Soc, New York, 1952. MR 0007095
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