@misc{indiciaec94c6598c7be,
  title = {E region coupling effects on the Perkins spread F instability},
  author = {Klevans, E. H. and Imel, G.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780039636},
  note = {Source identifier: 19780039636}
}