@article{etna_vol44_pp289-305,
  author  = {N. J. Ford and M. L. Morgado and M. Rebelo},
  title   = {An implicit finite difference approximation for the solution of the diffusion equation with distributed order in time},
  journal = {Electron. Trans. Numer. Anal.},
  volume  = {44},
  year    = {2015},
  pages   = {289--305},
}