@misc{indiciaea9e21fff6775,
  title = {Analysis of errors in HEM bird calibration},
  author = {D.V. Fitterman},
  year = {1997},
  doi = {10.3133/ofr97742},
  url = {https://pubs.usgs.gov/publication/ofr97742},
  note = {Source identifier: ofr97742}
}