@misc{indiciaeb9ef89425a3a,
  title = {Denitrification in nitrate-contaminated groundwater: Occurrence in steep vertical geochemical gradients},
  author = {R. L. Smith and B.L. Howes and J.H. Duff},
  year = {1991},
  doi = {10.1016/0016-7037(91)90026-2},
  url = {https://pubs.usgs.gov/publication/70016655},
  note = {Source identifier: 70016655}
}