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Communicated by G. Lallement
This research was partially supported by a grant from the University of Louisville.
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Levi, I., Seif, S. On congruences of-normal semigroups-normal semigroups. Semigroup Forum 43, 93–113 (1991). https://doi.org/10.1007/BF02574255
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DOI: https://doi.org/10.1007/BF02574255