Innovative operational matrices based computational scheme for fractional diffusion problems with the Riesz derivativeM. Hamid, M. Usman, T. Zubair, R. U. Haq and W. WangEur. Phys. J. Plus, 134 10 (2019) 484DOI: https://doi.org/10.1140/epjp/i2019-12871-y