Kunrattanaworawong, Jiraporn, and Wutiphol Sintunavarat. “On the General Solution and Stability of the Functional Equation \(f (x-Y) - f(x) f(y) = dsinxsiny\)”. Modern Mathematical Methods 3, no. 2 (August 20, 2025): 85–91. Accessed August 30, 2025. https://modernmathmeth.com/index.php/pub/article/view/67.