@misc{indiciae0316e4cfb4ae,
  title = {D-region differential-phase measurements and ionization variability studies},
  author = {Weiland, R. M. and Bowhill, S. A.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19790010339},
  note = {Source identifier: 19790010339}
}