@misc{indiciae72a32b52fa30,
  title = {Air traffic control surveillance accuracy and update rate study},
  author = {Craigie, J. H. and Morrison, D. D. and Zipper, I.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19740021981},
  note = {Source identifier: 19740021981}
}