@misc{indiciae15aa822baa3a,
  title = {Monitoring the Ionosphere Using a Global GPS Network: Validation and Applications},
  author = {Wilson, B. D. and Mannucci, A. J. and Yuan, D. N. and Iijima, B. A. and Pi, X. and Ho, C. M. and Lindqwister, U. J.},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/20060035342},
  note = {Source identifier: 20060035342}
}