Qiao, Xiaoyu (January 20, 2015). "Tricolorability.pdf"(PDF). Knot Theory Week 2: Tricolorability. Archived from the original(PDF) on May 25, 2024. Retrieved May 25, 2024.
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Qiao, Xiaoyu (January 20, 2015). "Tricolorability.pdf"(PDF). Knot Theory Week 2: Tricolorability. Archived from the original(PDF) on May 25, 2024. Retrieved May 25, 2024.