Borodin M, Han H, Ji K, Khovanova T, Peng A, Sun D, Tu I, Yang J, Yang W, Zhang K, Zhao K. Chip-Firing and Fractional Bases. mjum. 2021;6(1). Accessed April 20, 2024. https://pubs.lib.umn.edu/index.php/mjum/article/view/4235