@misc{indiciaecf3be2592efc,
  title = {Interplanetary field and geomagnetic variations - A unified view.},
  author = {Colburn, D. S. and Hirshberg, J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690054320},
  note = {Source identifier: 19690054320}
}