@misc{indiciae70e0444c5a13,
  title = {Satellite Power Systems (SPS) concept definition study (Exhibit D). Volume 4: Operations analyses},
  author = {Hanley, G. M.},
  year = {1981},
  url = {https://ntrs.nasa.gov/citations/19810011039},
  note = {Source identifier: 19810011039}
}