@misc{indiciae64879ef2f1cc,
  title = {Optical (diffuse reflectance) and Mossbauer spectroscopic study of nontronite and related Fe-bearing smectites},
  author = {David M. Sherman and N. Vergo},
  year = {1988},
  url = {https://pubs.usgs.gov/publication/70014161},
  note = {Source identifier: 70014161}
}