@misc{indiciaedcc5c5a8b1fd,
  title = {Evaluation of the 1985-1990 IGRF secular variation candidates},
  author = {J.C. Cain and C. Kluth},
  year = {1987},
  doi = {10.1016/0031-9201(87)90161-0},
  url = {https://pubs.usgs.gov/publication/70014180},
  note = {Source identifier: 70014180}
}