@misc{indiciae3052435e88e5,
  title = {A Testbed for Geomagnetic Data Assimilation},
  author = {K Gwirtz and M Morzfeld and W Kuang and A Tangborn},
  year = {2021},
  url = {https://ntrs.nasa.gov/citations/20220000447},
  note = {Source identifier: 20220000447}
}