@misc{indiciae25c53405c78b,
  title = {Document Update and Compare},
  author = {Knoch, C. F. and Caldwell, D. C. and Caldwell, D. L.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19820000364},
  note = {Source identifier: 19820000364}
}