1. Lakshmikantham, V. and Rao, M., Theory of Integro-Differential Equations, London: Gordon and Breach, 1995.
2. He, J.H., Some Applications of Nonlinear Fractional Differential Equations and Their Approximations, Bull. Sci. Technol., 1999, vol. 15, no. 2, pp. 86–90.
3. Kilbas, A., Srivastava, H., and Trujillo, J., Theory and Applications of Fractional Differential Equations, Amsterdam: Elsevier, 2006.
4. Abdou, M.A., On a Symptotic Methods for Fredholm–Volterra Integral Equation of the Second Kind in Contact Problems, J. Comput. Appl. Math., 2003, vol. 154, iss. 2, pp. 431–446.
5. Le, T.D., Moyne, C., Murad, M.A., and Lima, S.A., A Two-Scale Non-Local Model of Swelling Porous Media Incorporating Ion Size Correlation Effects, J. Mech. Phys. Solids, 2013, vol. 61, iss. 12, pp. 2493–2521.