@misc{indiciae4c8c901c1196,
  title = {Concentrations of metals in very small volumes of soil solution},
  author = {T. Hinkley},
  year = {1979},
  doi = {10.1038/277444a0},
  url = {https://pubs.usgs.gov/publication/70012477},
  note = {Source identifier: 70012477}
}