Chen, Yinsong, and Vladislav Kargin. “ On Enumeration and Entropy of Ribbon Tilings”. The Electronic Journal of Combinatorics 30, no. 2 (April 21, 2023): P2.15. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v30i2p15.