@misc{indiciae11da95c2a936,
  title = {Current loops fitted to geomagnetic model spherical harmonic coefficients.},
  author = {L.R. Alldredge},
  year = {1987},
  doi = {10.5636/jgg.39.271},
  url = {https://pubs.usgs.gov/publication/70014736},
  note = {Source identifier: 70014736}
}