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[1] E. Cech: “Topological spaces”, Interscience Publishers, John Wiley & Sons, (1966)
[2] A.H. Clifford & G.B. Preston: “The Algebraic Theory of Semigroups”, Math. Surveys No. 7, Amer. Math. Soc., Providence, RI, Vol. I (1961)
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[11] W.D. Munn: Some recent results on the structure of inverse semigroups, in “Semigroups Proceedings of a Symposium”, Academic Press, New York 1969
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