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"On the 3-colorability of planar graphs without 4-, 7- and 9-cycles."
Huajing Lu et al. (2009)
- Huajing Lu, Yingqian Wang
, Weifan Wang, Yuehua Bu, Mickaël Montassier, André Raspaud:
On the 3-colorability of planar graphs without 4-, 7- and 9-cycles. Discret. Math. 309(13): 4596-4607 (2009)

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