Kasraoui, Anisse, and Jiang Zeng. “Distribution of Crossings, Nestings and Alignments of Two Edges in Matchings and Partitions”. The Electronic Journal of Combinatorics 13, no. 1 (April 4, 2006): #R33. Accessed June 9, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v13i1r33.