... Ezz-Eldien, SS: A quadrature tau method for variable coefficients fractional differential equations. Appl. Math. Lett. 24,2146–2152 (2011)20. Saadatmandi, A, Dehghan, M: A new operational matrix for solvingfractional-order ... fractional differential equations with con-vergence analysis. Comput. Math. Appl. 61, 30–43 (2011)23. Vanani, SK, Aminataei, A: Tau approximate solution of fractional partialdifferential equations. ... Khan, Y, Faraz, N, Yildirim, A, Wu, Q: Fractional variational iteration method for fractional initial-boundary value problems arising in the appli-cation of nonlinear science. Comput. Math. Appl....