@misc{indiciaeab39889a7d09,
  title = {Air-Traffic Controllers Evaluate The Descent Advisor},
  author = {Tobias, Leonard and Volckers, Uwe and Erzberger, Heinz},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920000493},
  note = {Source identifier: 19920000493}
}