@misc{indiciae15f21a490d90,
  title = {Interplanetary field and geomagnetic variations a unified view},
  author = {Colburn, D. S. and Hirshberg, J.},
  year = {1969},
  url = {https://ntrs.nasa.gov/citations/19690075250},
  note = {Source identifier: 19690075250}
}