@misc{indiciaeb9cf47c188cb,
  title = {Drift shell splitting by internal geomagnetic multipoles.},
  author = {Roederer, J. G. and Hilton, H. H. and Schulz, M.},
  year = {1973},
  url = {https://ntrs.nasa.gov/citations/19730034434},
  note = {Source identifier: 19730034434}
}