@misc{indiciae1621e79aa3d7,
  title = {New trend- trigonometric model for interpolation and prediction of the geomagnetic field utilizing the new DGRF models},
  author = {L.R. Alldredge},
  year = {1988},
  doi = {10.5636/jgg.40.749},
  url = {https://pubs.usgs.gov/publication/70014816},
  note = {Source identifier: 70014816}
}