@misc{indiciae08fa8b1b36c7,
  title = {Evaluation of conceptual models of natural organic matter (humus) from a consideration of the chemical and biochemical processes of humification},
  author = {Robert L. Wershaw},
  year = {2004},
  doi = {10.3133/sir20045121},
  url = {https://pubs.usgs.gov/publication/sir20045121},
  note = {Source identifier: sir20045121}
}