Blake, Heather S., Stefan Felsner, Rimma Hämäläinen, and Marcin Witkowski. “On the Erdős-Szekeres Problem for Convex Permutations and Orthogonally Convex Point Sets”. The Electronic Journal of Combinatorics 32, no. 4 (November 14, 2025): P4.49. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i4p49.