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"Planar graphs without cycles of length 4, 7, 8, or 9 are 3-choosable."
Yingqian Wang, Qian Wu, Liang Shen (2011)
- Yingqian Wang, Qian Wu, Liang Shen:
Planar graphs without cycles of length 4, 7, 8, or 9 are 3-choosable. Discret. Appl. Math. 159(4): 232-239 (2011)
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