@misc{indiciae4c8e920d02a0,
  title = {Wolf nipple measurements as indices of age and breeding status},
  author = {L. David Mech and Thomas J. Meier and Ulysses S. Seal},
  year = {1993},
  doi = {10.2307/2426507},
  url = {https://pubs.usgs.gov/publication/5222841},
  note = {Source identifier: 5222841}
}