@misc{indiciae980da7e12733,
  title = {11.12 – Tools and techniques: gravitational method},
  author = {Jeffrey Phillips},
  year = {2015},
  doi = {10.1016/b978-0-444-53802-4.00197-4},
  url = {https://pubs.usgs.gov/publication/70146890},
  note = {Source identifier: 70146890}
}