@misc{indiciaec900110d8c0e,
  title = {Extraction and speciation of arsenic in lacustrine sediments},
  author = {W. H. Ficklin},
  year = {1990},
  doi = {10.1016/0039-9140(90)80127-2},
  url = {https://pubs.usgs.gov/publication/70016043},
  note = {Source identifier: 70016043}
}