Ghadir SADEGHI, Reza SAADATI, Mohammad JANFADA, John M. RASSIAS
Hacettepe Journal of Mathematics and Statistics
571-579
Generalized Hyers-Ulam stability, Euler-Lagrange functional equation, Non-Archimedean normed space, p-adic field, 2000 AMS Classification: Primary 39B22, Secondary 39B82, 46S10