Operational-matrix-based algorithm for differential equations of fractional order with Dirichlet boundary conditionsMuhammad Usman, Muhammad Hamid, Tamour Zubair, Rizwan Ul. Haq and Wei WangEur. Phys. J. Plus, 134 6 (2019) 279DOI: https://doi.org/10.1140/epjp/i2019-12653-7