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Communicated by P. S. Mostert
Dedicated to Professor E. S. Lyapin on his 70th birthday
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Magill, K.D. Congruences on semigroups of continuous selfmaps. Semigroup Forum 29, 159–182 (1984). https://doi.org/10.1007/BF02573323
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DOI: https://doi.org/10.1007/BF02573323