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"Improper choosability of graphs of nonnegative characteristic."
Yongzhu Chen, Weiyi Zhu, Weifan Wang (2008)
- Yongzhu Chen, Weiyi Zhu, Weifan Wang:
Improper choosability of graphs of nonnegative characteristic. Comput. Math. Appl. 56(8): 2073-2078 (2008)
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