Jagan Mohan, J., N. Shobanadevi, and G.V.S.R. Deekshitulu. 2014. “STABILITY OF NONLINEAR NABLA FRACTIONAL DIFFERENCE EQUATIONS USING FIXED POINT THEOREMS ”. Italian Journal of Pure and Applied Mathematics 32 (August):165-84. https://journals.uniurb.it/index.php/ijpam/article/view/6224.