@misc{indiciaebb1ce481c9f4,
  title = {Estimates of diffuse phosphorus sources in surface waters of the United States using a spatially referenced watershed model},
  author = {R. B. Alexander and R. A. Smith and G. E. Schwarz},
  year = {2004},
  doi = {10.2166/wst.2004.0150},
  url = {https://pubs.usgs.gov/publication/70027214},
  note = {Source identifier: 70027214}
}