S. Pinelas, M. Arunkumar, N. Mahesh Kumar, and E. Sathya. “Stability of General Quadratic-Cubic-Quartic Functional Equation in Quasi Beta Banach Space via Two Dissimilar Methods”. Malaya Journal of Matematik, vol. 6, no. 01, Jan. 2018, pp. 113-28, doi:10.26637/MJM0601/0015.