@misc{indiciaef1395b3214b9,
  title = {Fourier power spectra of the geomagnetic field for circular paths on the Earth's surface.},
  author = {L.R. Alldredge and E.R. Benton},
  year = {1986},
  url = {https://pubs.usgs.gov/publication/70014590},
  note = {Source identifier: 70014590}
}