@misc{indiciae4efe58f8ebcc,
  title = {The ionospheric impact on GPS performance in southern polar region},
  author = {C.-K. Hong and D. A. Grejner-Brzezinska and N. Arslan and M. Willis and L. Hothem},
  year = {2006},
  url = {https://pubs.usgs.gov/publication/70028645},
  note = {Source identifier: 70028645}
}