@misc{indiciaeb4f20c6ea0df,
  title = {Power of sign surveys to monitor population trend},
  author = {Katherine C. Kendall and Lee H. Metzgar and David A. Patterson and Brian M. Steele},
  year = {1992},
  doi = {10.2307/1941877},
  url = {https://pubs.usgs.gov/publication/1008642},
  note = {Source identifier: 1008642}
}