@misc{indiciaeb3b5ec67ffcf,
  title = {Observability during planetary approach navigation},
  author = {Bishop, Robert H. and Burkhart, P. Daniel and Thurman, Sam W.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19950049805},
  note = {Source identifier: 19950049805}
}