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Communicated by N. R. Reilly
Work on this paper was done while the first author was visiting the University of Nebraska at Lincoln under a Faculty Exchange Program with Colorado State University.
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Hardy, D.W., Thornton, M.C. Partial orders and their semigroups of closed relations. Semigroup Forum 25, 171–184 (1982). https://doi.org/10.1007/BF02573596
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DOI: https://doi.org/10.1007/BF02573596