@article{Becker2008,
  author    = {Reinard Becker},
  title     = {Improvement of FDM by extrapolation on multiple grids},
  journal   = {Physics procedia},
  volume    = {1},
  number    = {1},
  pages     = {245 -- 248},
  doi       = {10.1016/j.phpro.2008.07.102},
  year      = {2008},
}