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"The 4-Choosability of Plane Graphs without 4-Cycles'."
Peter Che Bor Lam, Baogang Xu, Jiazhuang Liu (1999)
- Peter Che Bor Lam, Baogang Xu, Jiazhuang Liu:
The 4-Choosability of Plane Graphs without 4-Cycles'. J. Comb. Theory B 76(1): 117-126 (1999)
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