@misc{indiciae3b8195f6370b,
  title = {Geomagnetic temporal change: 1903-1982 - A spline representation},
  author = {Langel, R. A. and Kerridge, D. J. and Barraclough, D. R. and Malin, S. R. C.},
  year = {1986},
  url = {https://ntrs.nasa.gov/citations/19870047342},
  note = {Source identifier: 19870047342}
}