1. T. Aoki, On the stability of the linear transformation in Banach spaces, J. Math. Soc. Japan 2(1950) 64–66.
2. R. Badora, On approximate derivations, Math. Ineq. Appl. 9(1)(2006), 167–173.
3. L. Cădariu, V. Radu, On the stability of the Cauchy functional equation: a fixed point approach, ITERATION THEORY (ECIT ’02), Grazer Math. Ber., Berichit Nr. 346(2004), 43–52.
4. S. Czerwik, Functional Equations and Inequalities in Several Variables, World Scientific, Singapore, 2002.
5. H.G. Dales, M.S. Moslehian, Stability of mappings on multi-normed spaces, Glasgow Math. J., 49(2007) 321–332.