Kabbun, N., W. Jantai, D. Than, and M. Kooakachai. “Stochastic Models for Breaking Large Bills and Coins: Annual Meeting in Mathematics 2024”. Thai Journal of Mathematics, vol. 23, no. 1, Mar. 2025, pp. 57–71, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1765.