@misc{indiciaeed7c5a5450a9,
  title = {Techniques of trend analysis for monthly water-quality data},
  author = {Robert M. Hirsch and James Richard Slack and Richard A. Smith},
  year = {1981},
  doi = {10.3133/ofr81488},
  url = {https://pubs.usgs.gov/publication/ofr81488},
  note = {Source identifier: ofr81488}
}