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References:
[1] C. Berge: Graphes et hypergraphes. Dunod, Paris 1970. MR 0357173 | Zbl 0213.25702
[2] P. L. Hammer S. Rudeanu: Boolean methods in operations research and related areas. Springer-Verlag, Berlin-Heidelberg-New York 1968. MR 0235830
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