Ito, Noboru, and Yusuke Takimura. “Any Nontrivial Knot Projection With No Triple Chords Has a Monogon or a Bigon”. Topology Proceedings 60 (August 20, 2021): 31–44. Accessed June 30, 2026. https://www.topologyproceedings.org/index.php/tp/article/view/59.