@misc{indiciaece020fb92581,
  title = {Chemical structure of humic acids - Part 2, the molecular aggregation of some humic acid fractions in N, N-dimethylformamide},
  author = {R.L. Wershaw and D.J. Pinckney},
  year = {1977},
  url = {https://pubs.usgs.gov/publication/70163072},
  note = {Source identifier: 70163072}
}