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References:
[1] Z. HEDRLÍN: On universal partly ordered sets and classese. Journ. of Alg. 11, 4 (1969), 503-509. MR 0238919
[2] P. HELL J. NEŠETŘIL: Graphs and k-societies. Canad. Math. Bulletin 13, 3 (1970), 375-381. MR 0276124
[3] L. KUČERA: On universal concrete categories. to appear in Algebra Universalis 1 (1971). MR 0404385
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