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Communicated by Boris M. Schein
Dedicated to L. M. Gluskin On the Occasion of His 60th Birthday
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Millar, D.W. Semigroups containing ubiquitous elements. Semigroup Forum 25, 193–202 (1982). https://doi.org/10.1007/BF02573598
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DOI: https://doi.org/10.1007/BF02573598