@misc{indiciae0d652dfddb62,
  title = {Characterization and diagenesis of strong-acid carboxyl groups in humic substances},
  author = {J.A. Leenheer and R.L. Wershaw and G.K. Brown and M.M. Reddy},
  year = {2003},
  doi = {10.1016/s0883-2927(02)00100-2},
  url = {https://pubs.usgs.gov/publication/70025964},
  note = {Source identifier: 70025964}
}