@misc{indiciaef1f44f95012b,
  title = {Mortality in tundra swans Cygnus columbianus},
  author = {James C. Bartonek and J.R. Serie and K. A. Converse},
  year = {1991},
  url = {https://pubs.usgs.gov/publication/1003844},
  note = {Source identifier: 1003844}
}