@misc{indiciaea1ff79c38ff5,
  title = {A line transect model for aerial surveys},
  author = {Pham Xuan Quang and Richard B. Lanctot},
  year = {1991},
  doi = {10.2307/2532661},
  url = {https://pubs.usgs.gov/publication/70180935},
  note = {Source identifier: 70180935}
}