Drexel, Matthew, Xuanshan Peng, and Jacob Richey. “Word Length, Bias and Bijections in Penney’s Ante”. The Electronic Journal of Combinatorics 32, no. 4 (November 28, 2025): P4.57. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i4p57.