@misc{indiciaeb5bbddafa906,
  title = {MGGHAT: Elliptic PDE software with adaptive refinement, multigrid and high order finite elements},
  author = {Mitchell, William F.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940016997},
  note = {Source identifier: 19940016997}
}