@misc{indiciaec1fb20f938c1,
  title = {VLF mode analysis using a ceramic dielectric model of the earth-ionosphere waveguide},
  author = {Peden, I. C. and Webber, G. E.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19700036476},
  note = {Source identifier: 19700036476}
}