@misc{indiciae64689413d455,
  title = {Behaviour of captive canvasbacks Aythya valisineria fed different diets during winter},
  author = {Matthew C. Perry and B. Kenneth Williams and H.H. Obrecht},
  year = {1989},
  url = {https://pubs.usgs.gov/publication/5222303},
  note = {Source identifier: 5222303}
}