Spiegelhofer, Lukas, and Jeffrey Shallit. “Continuants, Run Lengths, and Barry’s Modified Pascal Triangle”. The Electronic Journal of Combinatorics 26, no. 1 (March 8, 2019): P1.31. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v26i1p32.