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"Planar graphs without 7-cycles and butterflies are DP-4-colorable."
Seog-Jin Kim, Runrun Liu, Gexin Yu (2020)
- Seog-Jin Kim, Runrun Liu, Gexin Yu:
Planar graphs without 7-cycles and butterflies are DP-4-colorable. Discret. Math. 343(8): 111714 (2020)
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