Mol, Lucas, Narad Rampersad, and Jeffrey Shallit. “Extremal Overlap-Free and Extremal $\beta$-Free Binary Words”. The Electronic Journal of Combinatorics 27, no. 4 (December 11, 2020): P4.42. Accessed March 17, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v27i4p42.