Reference
Tsalenko, M. S.,Representations of Concrete Categories in the Category of Sets, Mat. Zametki6, 125–127 (1969).
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Platt, C.R. Example of a concrete category with no embedding into sets under which every epimorphism is represented by a surjection. Algebra Univ. 1, 128 (1971). https://doi.org/10.1007/BF02944967
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DOI: https://doi.org/10.1007/BF02944967