@misc{indiciae938a6c49a8b4,
  title = {Global Ionospheric Mapping using GPS: Validation and Future Prospects},
  author = {Wilson, Brian D. and Mannucci, Anthony J. and Yuan, Dah-Ning and Ho, Christian and Pi, Xiaoqing and Runge, Tom and Lindqwister, Ulf J.},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/19980000369},
  note = {Source identifier: 19980000369}
}