Reference
Patrich, Mario,Introduction to Semigroups, Merrill Publishing Company, Columbus, Ohio, (1973).
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Communicated by N. R. Reilly
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Nordahl, T.E., Scheiblich, H.E. Which semilattice indecomposables are groups?. Semigroup Forum 22, 243–245 (1981). https://doi.org/10.1007/BF02572803
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DOI: https://doi.org/10.1007/BF02572803