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"Planar 4-critical graphs with four triangles."
Oleg V. Borodin et al. (2014)
- Oleg V. Borodin, Zdenek Dvorák, Alexandr V. Kostochka, Bernard Lidický, Matthew P. Yancey:
Planar 4-critical graphs with four triangles. Eur. J. Comb. 41: 138-151 (2014)
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