John Micheal Rassias, Elumalai Sathya, and Mohan Arunkumar. 2021. “Stabilities of Mixed Type Quintic-Sextic Functional Equations in Various Normed Spaces”. Malaya Journal of Matematik 9 (01). India:217-43. https://www.malayajournal.org/index.php/mjm/article/view/1006.