@misc{indiciaeeb3419312a9c,
  title = {The contribution of humic substances to the acidity of colored natural waters},
  author = {B.G. Oliver and E.M. Thurman and Ronald L. Malcolm},
  year = {1983},
  doi = {10.1016/0016-7037(83)90218-1},
  url = {https://pubs.usgs.gov/publication/70011320},
  note = {Source identifier: 70011320}
}