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Communicated by N. R. Reilly
Research supported by a grant from M.P.I. (Italy)
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Catino, F., Migliorini, F. Magnifying elements in semigroups. Semigroup Forum 44, 314–319 (1992). https://doi.org/10.1007/BF02574350
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DOI: https://doi.org/10.1007/BF02574350