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https://doi.org/10.1016/0012-365x(94)00063-o
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Cite Journal: Discrete Mathematics |  Publication Date: Oct 1, 1995 |
 Citations: 39 |  License type: elsevier-specific: oa user license |
Affiliation: University of Cambridge
For given n, let G be a triangle-free graph of order n with chromatic number at least 4. In this paper, we shall prove a conjecture of Häggkvist by determining the maximal value of δ( G).
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