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"4-Critical Graphs on Surfaces Without Contractible $(\le\!4)$-Cycles."
Zdenek Dvorák, Bernard Lidický (2014)
- Zdenek Dvorák, Bernard Lidický:
4-Critical Graphs on Surfaces Without Contractible $(\le\!4)$-Cycles. SIAM J. Discret. Math. 28(1): 521-552 (2014)
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