@misc{indiciae9ceed2603cde,
  title = {Factors affecting detectability of river otters during sign surveys},
  author = {Mackenzie R. Jeffress and Craig P. Paukert and Brett K. Sandercock and Philip S. Gipson},
  year = {2011},
  doi = {10.1002/jwmg.12},
  url = {https://pubs.usgs.gov/publication/70150462},
  note = {Source identifier: 70150462}
}