Coons, Michael, and Lukas Spiegelhofer. “The Maximal Order of Hyper-($b$-Ary)-Expansions”. The Electronic Journal of Combinatorics 24, no. 1 (February 3, 2017): P1.15. Accessed March 14, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v24i1p15.