Blake, H. S., S. Felsner, R. Hämäläinen, and M. Witkowski. “On the Erdős-Szekeres Problem for Convex Permutations and Orthogonally Convex Point Sets”. The Electronic Journal of Combinatorics, Vol. 32, no. 4, Nov. 2025, p. P4.49, doi:10.37236/13543.