Abstract
A counter-example to a conjecture of T. Gallai and G. A. Dirac is given.
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References
T. Gallai, Critical graphs, in:Theory of Graphs and its Applications (Proc. Symp. Smolenice 1963), Publ. House CzechoslovakAcad. Sci., Prague 1964, 43–45.
G. Koester, Bemerkung zu einem Problem von H. Grötzsch.Wiss. Z. Univ. Halle, XXXIII (1984), M.H.5. S.129.
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Koester, G. Note to a problem of T. Gallai and G. A. Dirac. Combinatorica 5, 227–228 (1985). https://doi.org/10.1007/BF02579365
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DOI: https://doi.org/10.1007/BF02579365