NILASINWONG, L.; KUHAPATANAKUL, K. Sums of Reciprocal Triangular Numbers. Progress in Applied Science and Technology, Thailand, v. 10, n. 2, p. 14–17, 2020. DOI: 10.14456/past.2020.4. Disponível em: https://ph02.tci-thaijo.org/index.php/past/article/view/242160. Acesso em: 19 may. 2024.