@misc{indiciae43ab98e31d8e,
  title = {Regional Kendall test for trend},
  author = {D.R. Helsel and L.M. Frans},
  year = {2006},
  doi = {10.1021/es051650b},
  url = {https://pubs.usgs.gov/publication/70028525},
  note = {Source identifier: 70028525}
}