1. Chen, S., Liu, F., Jiang, X., Turner, I., Anh, V.: A fast semi-implicit difference method for a nonlinear two-sided space-fractional diffusion equation with variable diffusivity coefficients. Appl. Math. Comput. 257, 591–601 (2015)
2. Podlubny, I.: Fractional Differential Equations. Academic Press, New York (1999)
3. Meerschaert, M.M., Sikorskii, A.: Stochastic Models for Fractional Calculus. De Gruyter, Berlin (2012)
4. Liu, F., Meerschaert, M.M., Mcgough, R.J., Zhuang, P., Liu, Q.: Numerical methods for solving the multi-term time-fractional wave-diffusion equation. Fract. Calc. Appl. Anal. 16(1), 9–25 (2013)
5. Hao, Z.P., Sun, Z.Z., Cao, W.R.: A fourth-order approximation of fractional derivatives with its applications. J. Comput. Phys. 281, 787–805 (2015)