@misc{40376,
  author = {William Mitchell},
  title = {MGGHAT User's Guide Version 1.1},
  year = {1997},
  month = {1997-01-01},
  publisher = {NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.5948},
  language = {en},
}