@misc{1155586,
  author = {LA Fine and J W Wright},
  title = {Mean electron density variations of the quiet ionosphere 4:},
  year = {1959},
  month = {1959-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.TN.40-4},
  language = {en},
}