Jin, Emma Yu, and Markus E. Nebel. “A Combinatorial Proof of the Recurrence for Rook Paths”. The Electronic Journal of Combinatorics 19, no. 1 (March 19, 2012): P57. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v19i1p57.