@misc{indiciae2f517747dd53,
  title = {Manned geosynchronous mission requirements and systems analysis study. Volume 1: Executive summary},
  author = {Boyland, R. E. and Sherman, S. W. and Morfin, H. W.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19800006927},
  note = {Source identifier: 19800006927}
}