@misc{indiciae6f94aa419a8c,
  title = {Decrease in eggshell weight in certain birds of prey.},
  author = {D A Ratcliffe},
  year = {1967},
  doi = {10.1038/215208a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/6049131/},
  note = {Source identifier: 6049131}
}