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Communicated by D.B. McAlister
This research supported by NSF Grant No. ISP-8011451.
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LaTorre, D.R. Group congruences on regular semigroups. Semigroup Forum 24, 327–340 (1982). https://doi.org/10.1007/BF02572776
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DOI: https://doi.org/10.1007/BF02572776