Paquin, Geneviève, and Laurent Vuillon. “A Characterization of Balanced Episturmian Sequences”. The Electronic Journal of Combinatorics 14, no. 1 (May 9, 2007): #R33. Accessed April 12, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v14i1r33.