Sakai, Toshinori, and Jorge Urrutia. “Non-Crossing Monotone Paths and Cycles through Specified Points of Labeled Point Sets: Discrete and Computational Geometry, Graphs, and Games”. Thai Journal of Mathematics 21, no. 4 (December 31, 2023): 855–861. Accessed May 9, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1550.