Pan, Qiongqiong, and Cheng Qian. “On the $cd$-Index for Alternating Descents”. The Electronic Journal of Combinatorics 31, no. 4 (November 1, 2024): #P4.29. Accessed May 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v31i4p29.