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Baird, G. and G. Thierrin,On Semigroups in which every Rees One-sided Congruence is a Congruence, Semigroup Forum 4 (1972), 215–223.
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Jordan, M.J., On Some Classes of H-semigroups, Semigroup Forum 2 (1971), 49–54.
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Communicated by A. H. Clifford