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References:
[1] M. Behzad G. Chartrand, and L. Lesniak-Foster: Graphs & Digraphs. Prindle, Weber & Schmidt, Boston 1979. MR 0525578
[2] L. Nebeský: On certain extensions of intervals in graphs. Časopis pěst. mat. 115, 1990, 171-177. MR 1054004
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