@misc{indiciae1818c047773f,
  title = {Evaluation of ultrafiltration for determining molecular weight of fulvic acid},
  author = {G. R. Aiken},
  year = {2002},
  doi = {10.1021/es00130a016},
  url = {https://pubs.usgs.gov/publication/70013808},
  note = {Source identifier: 70013808}
}