@misc{1190541,
  author = {S M Ostrow},
  title = {Handbook for CRPL ionospheric predictions based on numerical methods of mapping:},
  year = {1962},
  month = {1962-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.HB.90},
  language = {en},
}