@misc{indiciaefd6f0a407a8a,
  title = {Filters for soft X-ray solar telescopes},
  author = {Spiller, Eberhard and Grebe, Kurt and Golub, Leon},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19900057244},
  note = {Source identifier: 19900057244}
}