@misc{indiciae67b13c0f738f,
  title = {Overwinter survival of mallards fed selenium},
  author = {Gary Heinz and M. A. Fitzgerald},
  year = {1993},
  doi = {10.1007/bf00230717},
  url = {https://pubs.usgs.gov/publication/5222857},
  note = {Source identifier: 5222857}
}