Team, S. “On the Additive $(s_1, s_2)$--Functional Inequality and Its Stability in Banach Spaces: Wuttichai Suriyacharoen, Wutiphol Sintunavarat”. Thai Journal of Mathematics, vol. 18, no. 3, Sept. 2020, pp. 1375-, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1077.