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"Coloring the square of a K4-minor free graph."
Ko-Wei Lih, Wei-Fan Wang, Xuding Zhu (2003)
- Ko-Wei Lih, Wei-Fan Wang, Xuding Zhu:
Coloring the square of a K4-minor free graph. Discret. Math. 269(1-3): 303-309 (2003)

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