@misc{indiciae754da3487d3f,
  title = {GT-CATS: Tracking Operator Activities in Complex Systems},
  author = {Callantine, Todd J. and Mitchell, Christine M. and Palmer, Everett A.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20030112107},
  note = {Source identifier: 20030112107}
}