Stability and Superstability of Generalized (Θ, Φ)-Derivations in Non-Archimedean Algebras: Fixed Point Theorem via the Additive Cauchy Functional Equation. - Madjid Eshaghi Gordji; Mohammad Bagher Ghaemi; Gwang Hui Kim; Badrkhan Alizadeh (J. Appl. Math., 2011)