@misc{indiciaea039228752ce,
  title = {A description of an extremely low frequency loop-loop geophysical system},
  author = {J. Cooke and J. Bradley and C. Mitchell and R. Lescelius},
  year = {1981},
  doi = {10.3133/ofr811130},
  url = {https://pubs.usgs.gov/publication/ofr811130},
  note = {Source identifier: ofr811130}
}