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References:
[1] M. Behzad G. Chartrand L. Lesniak-Foster: Graphs & Digraphs. Prindle, Weber & Schmidt, Boston 1979. MR 0525578
[2] H. M. Mulder: The interval Function of a Graph. Мathematisch Centrum, Amsterdam 1980. MR 0605838 | Zbl 0446.05039
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