@misc{indiciae9bab945e0fa3,
  title = {A new ionospheric model for wide area differential GPS: the multiple shell approach},
  author = {Komjathy, A. and Wilson, B. D. and Runge, T. F. and Boulat, B. M. and Mannucci, T. J. and Pi, X. and Reyes, M. J. and Sparks, L. C.},
  year = {2002},
  url = {https://ntrs.nasa.gov/citations/20060046236},
  note = {Source identifier: 20060046236}
}