Park, Youngja, and Sangwook Kim. “Chung-Feller Property of Schröder Objects”. The Electronic Journal of Combinatorics 23, no. 2 (May 13, 2016): P2.34. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i2p34.