On the generalized Ulam-Gavruta-Rassias stability of mixed-type linear and Euler-Lagrange-Rassias functional equations. Nakmahachalasint, Paisan — 2007 International Journal of Mathematics and Mathematical Sciences
Hyers-Ulam-Rassias and Ulam-Gavruta-Rassias stabilities of an additive functional equation in several variables. Nakmahachalasint, Paisan — 2007 International Journal of Mathematics and Mathematical Sciences