@misc{indiciaecf2932f67040,
  title = {Using stable isotopes to determine seabird trophic relationships},
  author = {Keith A. Hobson and John F. Piatt and Jay Pitocchelli},
  year = {1994},
  doi = {10.2307/5256},
  url = {https://pubs.usgs.gov/publication/70182757},
  note = {Source identifier: 70182757}
}