@misc{indiciaeb8dd3494f28f,
  title = {Ionospheric wave spectrum measurements},
  author = {Harker, K. J. and Ilic, D. B. and Crawford, F. W.},
  year = {1979},
  url = {https://ntrs.nasa.gov/citations/19790057378},
  note = {Source identifier: 19790057378}
}