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References:
[1] O. Ore: Theory of Graphs. Providence 1962. MR 0150753 | Zbl 0105.35401
[2] J. G. Stemple, M. E. Watkins: On planar geodetic graphs. J. Comb. Theory 2 (1968), 101-117. DOI 10.1016/S0021-9800(68)80035-3 | MR 0218267 | Zbl 0153.54004
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