Team, Support. “The Stability of the Pexiderized Cosine Functional Equation: C. Kusollerschariya, P. Nakmahachalasint”. Thai Journal of Mathematics 6, no. 3 (December 31, 2008): 39–44. Accessed April 29, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/132.