@misc{indiciae132bde1cd96a,
  title = {Limitations in the use of commercial humic acids in water and soil research},
  author = {Ronald L. Malcolm and P. MacCarthy},
  year = {2002},
  doi = {10.1021/es00151a009},
  url = {https://pubs.usgs.gov/publication/70015165},
  note = {Source identifier: 70015165}
}