Eskandani, G. Z., and J. M. Rassias. 2016. “Approximation of General α-Cubic Functional equations in 2-Banach Spaces”. Ukrains’kyi Matematychnyi Zhurnal 68 (10), 1430-36. https://umj.imath.kiev.ua/index.php/umj/article/view/1930.