@misc{indiciae9c4bc0ea36c1,
  title = {Estimability and simple dynamical analyses of range (range-rate range-difference) observations to artificial satellites},
  author = {Vangelder, B. H. W.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19790020040},
  note = {Source identifier: 19790020040}
}