Bród, Dorota, and Anetta Szynal-Liana. “On Mersenne Numbers and Their Bihyperbolic Generalizations”. Annales Mathematicae Silesianae (August 29, 2024). Accessed July 2, 2025. https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/17853.