@misc{indiciae751d291a5c7b,
  title = {Prediction of geomagnetic activity},
  author = {Goertz, C. K. and Shan, Lin-Hua and Smith, R. A.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930053285},
  note = {Source identifier: 19930053285}
}