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References:
[1] BOESCH F., TINDELL R.: Robbins's theorem for mixed multigraphs. Amer. math. Monthly 87, 1980, 716-719. MR 0602828 | Zbl 0453.05026
[2] PLESNÍK J.: Remarks od diameters of orientations of graphs. Acta Math. Univ. Comen., to appear. MR 0872345
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