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Dedicated to Dov Tamari on the occasion of his 70th birthday
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Magill, K.D., Subbiah, S. Regular ℐ-classes of semigroups of continua. Semigroup Forum 22, 159–179 (1981). https://doi.org/10.1007/BF02572795
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DOI: https://doi.org/10.1007/BF02572795