@misc{indiciae13ff9daf9223,
  title = {Using Christmas Bird Count data to assess population dynamics and trends of waterbirds},
  author = {G.S. Butcher and D.K. Niven and J.R. Sauer},
  year = {2005},
  url = {https://pubs.usgs.gov/publication/5224843},
  note = {Source identifier: 5224843}
}