@misc{indiciaea66d7a57be6e,
  title = {Cryogenic flux-concentrator},
  author = {Bailey, B. M. and Brechna, H. and Hill, D. A.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690000591},
  note = {Source identifier: 19690000591}
}