@misc{indiciae933b0f8b09c4,
  title = {Human error in aviation operations},
  author = {Billings, C. E. and Lanber, J. K. and Cooper, G. E.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19750053420},
  note = {Source identifier: 19750053420}
}