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References:
[1] F. Harary: Four Difficult Unsolved Problems in Graph Theory. In: M. Fiedler ed.: Recent Advances in Graph Theory. Academia Praha 1975, 249-256. MR 0382042 | Zbl 0329.05125
[2] H. M. Mulder: The interval function of a graph. Mathematisch Centrum. Amsterdam 1980. MR 0605838 | Zbl 0446.05039
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