Chen, William Y.C., and Jessica C.Y. Zhang. “The Skew and Relative Derangements of Type $B$”. The Electronic Journal of Combinatorics 14, no. 1 (November 5, 2007): N24. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v14i1n24.