@misc{indiciaee774e58324e6,
  title = {The quest for the perfect gravity anomaly: Part 1 - New calculation standards},
  author = {X. Li and T.G. Hildenbrand and W. J. Hinze and Gordon R. Keller and D. Ravat and M. Webring},
  year = {2006},
  doi = {10.1190/1.2370391},
  url = {https://pubs.usgs.gov/publication/70031060},
  note = {Source identifier: 70031060}
}