@misc{indiciae5bfef014d9f4,
  title = {Sunspot random walk and 22-year variation},
  author = {Jeffrey J. Love and E. Joshua Rigler},
  year = {2012},
  doi = {10.1029/2012gl051818},
  url = {https://pubs.usgs.gov/publication/70045158},
  note = {Source identifier: 70045158}
}