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Work supported in part by the U.S. Air Force Office of Scientific Research under Grant AF-AFOSR-754-65.
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Harary, F., Plummer, M.D. On the point-core of a graph. Math Z 94, 382–386 (1966). https://doi.org/10.1007/BF01111667
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DOI: https://doi.org/10.1007/BF01111667