Chen, William Y. C., Toufik Mansour, and Sherry H. F. Yan. “Matchings Avoiding Partial Patterns”. The Electronic Journal of Combinatorics 13, no. 1 (December 18, 2006): R112. Accessed March 15, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v13i1r112.