John Micheal Rassias, Elumalai Sathya, and Mohan Arunkumar. “Stabilities of Mixed Type Quintic-Sextic Functional Equations in Various Normed Spaces”. Malaya Journal of Matematik 9, no. 01 (January 1, 2021): 217–243. Accessed July 16, 2024. https://www.malayajournal.org/index.php/mjm/article/view/1006.