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"Reducing Hajós' 4-coloring conjecture to 4-connected graphs."
Xingxing Yu, Florian Zickfeld (2006)
- Xingxing Yu, Florian Zickfeld:
Reducing Hajós' 4-coloring conjecture to 4-connected graphs. J. Comb. Theory B 96(4): 482-492 (2006)
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