@misc{indiciae9df4562185b5,
  title = {Pinhole X-ray/coronagraph optical systems concept definition study},
  author = {Zehnpfenning, T. F. and Rappaport, S. and Wattson, R. B.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800023701},
  note = {Source identifier: 19800023701}
}