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References:
[1] C. Berge: Graphes et Hypergraphes. Dunod, Paris, 1970. MR 0357173 | Zbl 0213.25702
[2] L. Lovász: Graphs and set-systems. Beitrage zuг Graphentheorie (H.Sachs, H. S. Voss and H. Walther, eds.). Teubneг, 1968, pp. 99-106. MR 0244100
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