@misc{indiciae718ab0b25acd,
  title = {Microbial production of organic acids in aquitard sediments and its role in aquifer geochemistry},
  author = {P.B. McMahon and F. H. Chapelle},
  year = {1991},
  doi = {10.1038/349233a0},
  url = {https://pubs.usgs.gov/publication/70016557},
  note = {Source identifier: 70016557}
}