@misc{1157011,
  author = {Martha E Hinds},
  title = {Computer program for ionospheric mapping by numerical methods:},
  year = {1963},
  month = {1963-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.181},
  language = {en},
}