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"Every planar graph without cycles of length 4 or 9 is (1, 1, 0)-colorable."
Lifeng Dai, Yingqian Wang, Jinghan Xu (2017)
- Lifeng Dai, Yingqian Wang, Jinghan Xu:
Every planar graph without cycles of length 4 or 9 is (1, 1, 0)-colorable. Discret. Math. 340(9): 2108-2122 (2017)
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