@misc{indiciae45e8893ef7cc,
  title = {Very large and large geomagnetic storms and some problems in their theory},
  author = {Afanasyeva, V. I. and Kalinin, Yu. D.},
  year = {1963},
  url = {https://ntrs.nasa.gov/citations/19640001749},
  note = {Source identifier: 19640001749}
}