@misc{indiciae35877e12c6a1,
  title = {A model of the productivity of the northern pintail},
  author = {J.D. Carlson and W.R. Clark and Erwin E. Klaas},
  year = {1993},
  url = {https://pubs.usgs.gov/publication/2000083},
  note = {Source identifier: 2000083}
}