@misc{indiciaef97bb75beaf6,
  title = {Rectangular harmonic analysis applied to the geomagnetic field},
  author = {L.R. Alldredge},
  year = {2012},
  doi = {10.1029/jb086ib04p03021},
  url = {https://pubs.usgs.gov/publication/70186551},
  note = {Source identifier: 70186551}
}