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Invited address at the Bolyai Mathematical Society in Budapest on May 19th, 1967.
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Harary, F., Palmer, E.M. On the point-group and line-group of a graph. Acta Mathematica Academiae Scientiarum Hungaricae 19, 263–269 (1968). https://doi.org/10.1007/BF01894508
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DOI: https://doi.org/10.1007/BF01894508