@misc{indiciaef200406f888c,
  title = {Final-Approach-Spacing Subsystem For Air Traffic},
  author = {Davis, Thomas J. and Erzberger, Heinz and Bergeron, Hugh},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920000075},
  note = {Source identifier: 19920000075}
}