John M. Rassias, M. Arunkumar and P. Agilan 2018. Solution and two types of Ulam-Hyers stability of $n$-dimensional cubic-quartic functional equation in intuitionistic normed spaces. Malaya Journal of Matematik. 6, 01 (Jan. 2018), 213–229. DOI:https://doi.org/10.26637/MJM0601/0026.