@misc{indiciae628a5ff33a5f,
  title = {An analytical scheme for determining forms of sulphur in oil shales and associated rocks},
  author = {M. L. Tuttle and M. B. Goldhaber and D.L. Williamson},
  year = {1986},
  doi = {10.1016/0039-9140(86)80234-x},
  url = {https://pubs.usgs.gov/publication/70014591},
  note = {Source identifier: 70014591}
}