@misc{indiciaed84318a253ad,
  title = {Precise measurement method for ionospheric total electron content using signals from GPS satellites},
  author = {Imae, Michito and Kiuchi, Hitoshi and Kaneko, Akihiro and Hama, Shinichi and Miki, Chihiro},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910016460},
  note = {Source identifier: 19910016460}
}