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Dedicated to Professor E. S. Ljapin on the occasion of his 60th birthday.
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Schein, B.M. Injectives in certain classes of semigroups. Semigroup Forum 9, 159–171 (1974). https://doi.org/10.1007/BF02194844
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DOI: https://doi.org/10.1007/BF02194844