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To E.S. Ljapin on his 60th birthday on the 19th of September, 1974
This work was supported by a Temple University Faculty Research Award.
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Zitarelli, D.E. Compatible extensinos and subdirectly ireducible semigroups. Semigroup Forum 9, 241–252 (1974). https://doi.org/10.1007/BF02194853
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DOI: https://doi.org/10.1007/BF02194853