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"Planar graphs without cycles of length from 4 to 7 are 3-colorable."
Oleg V. Borodin et al. (2005)
- Oleg V. Borodin, Alexei N. Glebov, André Raspaud, Mohammad R. Salavatipour:
Planar graphs without cycles of length from 4 to 7 are 3-colorable. J. Comb. Theory B 93(2): 303-311 (2005)
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