@misc{indiciaeafe16032752c,
  title = {Influence of radio packs on captive mallards and blue-winged teal},
  author = {R. J. Greenwood and A.B. Sargeant},
  year = {1973},
  doi = {10.2307/3799732},
  url = {https://pubs.usgs.gov/publication/1001576},
  note = {Source identifier: 1001576}
}