@article{Gracia:130787,
      author        = "Gracia, José Luis and O’Riordan, Eugene and Stynes,
                       Martin",
      title         = "{Convergence analysis of a finite difference scheme for a
                       two-point boundary value problem with a
                       Riemann–Liouville–Caputo fractional derivative}",
      year          = "2020",
}