HENGKRAWIT, C.; PONPETCH, K. Functional Equations Characterizing the Tangent Function Over a Convex Polygon II. Thai Journal of Science and Technology, Pathumthani, Thailand, v. 5, n. 2, p. 113–118, 2016. DOI: 10.14456/tjst.2016.11. Disponível em: https://li01.tci-thaijo.org/index.php/tjst/article/view/64395. Acesso em: 28 mar. 2024.