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TO ALFRED H.CLIFFORD on his 65th birthday on the 11th of July, 1973
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Meirki, L., Steinfeld, O. A generalization of Green's relations in semigroups. Semigroup Forum 7, 74–85 (1974). https://doi.org/10.1007/BF02315967
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DOI: https://doi.org/10.1007/BF02315967