@misc{indiciaec3fe569fa785,
  title = {Ammonia fixation by humic substances: A nitrogen-15 and carbon-13 NMR study},
  author = {K. A. Thorn and M.A. Mikita},
  year = {1992},
  doi = {10.1016/0048-9697(92)90017-m},
  url = {https://pubs.usgs.gov/publication/70017318},
  note = {Source identifier: 70017318}
}