Team, S. “The Generalized Stability of an N-Dimensional Jensen Type Functional Equation: J. Tipyan, C. Srisawat, P. Udomkavanich, P. Nakmahachalasint”. Thai Journal of Mathematics, vol. 12, no. 2, Aug. 2014, pp. 265-74, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/452.