@misc{indiciae607f8423a509,
  title = {Calibrating a tensor magnetic gradiometer using spin data},
  author = {Robert E. Bracken and David V. Smith and Philip J. Brown},
  year = {2005},
  doi = {10.3133/sir20055045},
  url = {https://pubs.usgs.gov/publication/sir20055045},
  note = {Source identifier: sir20055045}
}