@misc{indiciae1d5761d1e60c,
  title = {How active was solar cycle 22?},
  author = {Hoegy, W. R. and Pesnell, W. D. and Woods, T. N. and Rottman, G. J.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19930067210},
  note = {Source identifier: 19930067210}
}