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 2024 Apr. 26];5(2):113-8. Available from: https://li01.tci-thaijo.org/index.php/tjst/article/view/64395