@misc{indiciae9b50b2bd3a24,
  title = {An empirical technique for computing navigation convariance matrices and the application of the technique to post Apollo 8 Lunar Orbit mission planning. Project Apollo},
  author = {Williamson, J. B.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700026442},
  note = {Source identifier: 19700026442}
}