@misc{indiciae5bef79fe21de,
  title = {A descriptive model for determining optimal human performance in systems. Volume 2 - Part A - System development activities concerned with putting man in an aerospace system. Part B - Development of man- machine systems - Some concepts and guidelines},
  year = {1968},
  url = {https://ntrs.nasa.gov/citations/19680005651},
  note = {Source identifier: 19680005651}
}