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References:
[1] A. H. Clifford, G. В. Preston: The algebraic theory of semigroups, vol I. Mathematical Surveys No. 7, Amer. Math. Soc. (1961). MR 0132791 | Zbl 0111.03403
[2] L. Fuchs: Partially ordered algebraic systems. Pergamon Press (1963). MR 0171864 | Zbl 0137.02001
[3] A. J. Hulin: Extensions of ordered semigroups. Semigroup Forum, vol. 2 (1971), 336-342. (research announcement) DOI 10.1007/BF02572300 | MR 0285460 | Zbl 0225.06006
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