@misc{indiciaef415493cbd19,
  title = {The quest for the perfect gravity anomaly: Part 2 - Mass effects and anomaly inversion},
  author = {Gordon R. Keller and T.G. Hildenbrand and W. J. Hinze and X. Li and D. Ravat and M. Webring},
  year = {2006},
  doi = {10.1190/1.2370393},
  url = {https://pubs.usgs.gov/publication/70030941},
  note = {Source identifier: 70030941}
}