Stability of mixed type cubic and quartic functional equations in random normed spaces. Gordji, M.Eshaghi; Savadkouhi, M.B. — 2009 Journal of Inequalities and Applications [electronic only]
Solution and stability of a mixed type cubic and quartic functional equation in quasi-Banach spaces. Gordji, M.Eshaghi; Zolfaghari, S.; Rassias, J.M.; Savadkouhi, M.B. — 2009 Abstract and Applied Analysis