@misc{indiciae7f053afc5908,
  title = {Extensive monitoring programmes viewed as long-term population studies: The case of North American waterfowl},
  author = {J.D. Nichols},
  year = {2008},
  doi = {10.1111/j.1474-919x.1991.tb07672.x},
  url = {https://pubs.usgs.gov/publication/5222866},
  note = {Source identifier: 5222866}
}