Kim, Younjin. “The Number of $k$-Dimensional Corner-Free Subsets of Grids”. The Electronic Journal of Combinatorics 29, no. 2 (June 17, 2022): P2.53. Accessed April 4, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v29i2p53.