References
G. Grätzer, Some results on universal algebras, mimeographed note, 1962.
G. Birkhoff andS. MacLane,A survey of modern algebra (Revised edition, 1953, Macmillen Co.)
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Makkai, M. Solution of a problem of G. Grätzer concerning endomorphism semigroups. Acta Mathematica Academiae Scientiarum Hungaricae 15, 297–307 (1964). https://doi.org/10.1007/BF01897138
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DOI: https://doi.org/10.1007/BF01897138