M. Arunkumar, John. M. Rassias, and G. Ganapathy. “Leibniz Type AQ-Functional Equation in Non-Archimedian Fuzzy Normed Spaces”. International Journal of Mathematics And Its Applications, vol. 4, no. 2 - C, June 2016, pp. 149-6, http://ijmaa.in/index.php/ijmaa/article/view/1055.