1.
Hamdi A. Symmetric Distribution of Crossings and Nestings in Permutations of Type $B$. Electron. J. Combin. [Internet]. 2011Oct.10 [cited 2026Mar.17];18(1):P200. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v18i1p200