@misc{indiciaeda0c224ee99d,
  title = {Evaluating the efficiency of man-machine systems},
  author = {Korolev, B. A. and Shlayen, P. Y.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730021355},
  note = {Source identifier: 19730021355}
}