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"Improper Choosability of Planar Graphs without 4-Cycles."
Yingqian Wang, Lingji Xu (2013)
- Yingqian Wang, Lingji Xu:
Improper Choosability of Planar Graphs without 4-Cycles. SIAM J. Discret. Math. 27(4): 2029-2037 (2013)
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