@misc{indiciaeee7d3e64f68e,
  title = {Some considerations for various positioning systems and their science capabilities},
  author = {Rey, Charles A. and Merkley, D. R. and Danley, T. J.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910012059},
  note = {Source identifier: 19910012059}
}