@misc{indiciaeb3100935052b,
  title = {A double-observer approach for estimating detection probability and abundance from point counts},
  author = {J.D. Nichols and J.E. Hines and J.R. Sauer and F.W. Fallon and J.E. Fallon and P.J. Heglund},
  year = {2000},
  doi = {10.1093/auk/117.2.393},
  url = {https://pubs.usgs.gov/publication/5223914},
  note = {Source identifier: 5223914}
}