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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: A characterization of the set of all shortest paths in a connected graph. Mathematica Bohemica 119 (1994), 15–20. MR 1303548
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