RABAGO, J. F. T. A Note on an OpenProblem by B. Sroysang. Progress in Applied Science and Technology, Thailand, v. 3, n. 1, p. 41–43, 2013. Disponível em: https://ph02.tci-thaijo.org/index.php/past/article/view/243242. Acesso em: 16 may. 2024.