1.
Hengkrawit C, Ponpetch K. Functional Equations Characterizing the Tangent Function Over a Convex Polygon II. Thai J. Sci. Technol. [internet]. 2016 Aug. 8 [cited 2026 Sep. 1];5(2):113-8. available from: https://li01.tci-thaijo.org/index.php/tjst/article/view/64395