Nguyen, Thi Thanh Ly. “The Ulam-Hyers Stability of 2-Variable Radical Functional Equations in Quasi-Banach Spaces”. Dong Thap University Journal of Science 13, no. 5 (June 26, 2024): 64–68. Accessed July 3, 2024. https://dthujs.vn/index.php/dthujs/article/view/1488.