@misc{indiciaed00931aa2383,
  title = {Scheduling technique improvement study for advanced programs. Volume 4: Ground support, test, training, investment, operations, advanced space transport program},
  author = {Crain, D. P.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19710029220},
  note = {Source identifier: 19710029220}
}