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References:
[1] C. BERGE: Graphs and Hypergraphs. Amsterdam, North-Holland Publ. Co. 1973. MR 0357172 | Zbl 0254.05101
[2] E. J. GRINBERG: Oral communication. Zbl 1166.82301
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[5] C. THOMASSEN: Counterexamples to Ádám's Conjecture on Arc Reversals in Directed Graphs. J. Comb. Th. B (1986).
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