Chewi, Sinho, and Venkat Anantharam. “A Combinatorial Proof of a Formula of Biane and Chapuy”. The Electronic Journal of Combinatorics 25, no. 1 (March 16, 2018): #P1.58. Accessed May 31, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v25i1p58.