@misc{indiciae2cd9ff2e4a99,
  title = {Data-based magnetic field models: Present status and future prospects},
  author = {T. I. Pulkkinen and H. E. J. Koskinen and R. J. Pellinen and V. A. Sergeev and N. A. Tsyganenko and H. J. Opgenoorth and E. Donovan},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19980024332},
  note = {Source identifier: 19980024332}
}