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Communicated by Boris Schein
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Billhardt, B. On a semigroup theoretic generalization of the Kalužnin Krasner Theorem and normal extensions of inverse semigroups. Semigroup Forum 44, 364–372 (1992). https://doi.org/10.1007/BF02574356
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DOI: https://doi.org/10.1007/BF02574356