@misc{indiciae3e9ab344e062,
  title = {Pc 3, 4 activity and interplanetary field orientation},
  author = {Greenstadt, E. W. and Olson, J. V.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19770034015},
  note = {Source identifier: 19770034015}
}