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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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Plummer, M.D. On a family of line-critical graphs. Monatshefte für Mathematik 71, 40–48 (1967). https://doi.org/10.1007/BF01299958
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DOI: https://doi.org/10.1007/BF01299958