@misc{indiciaef50147a5ef2b,
  title = {Low cost tracking Navaids error model verification},
  author = {Charych, A. and Tatz, A. and Lovell, J. and Frederick, R.},
  year = {1975},
  url = {https://ntrs.nasa.gov/citations/19750023123},
  note = {Source identifier: 19750023123}
}