@misc{indiciae177706ac7307,
  title = {Internal fertilization: adaptive value to early amniotes.},
  author = {G C Packard and D L Kilgore},
  year = {1968},
  doi = {10.1016/0022-5193(68)90193-8},
  url = {https://pubmed.ncbi.nlm.nih.gov/5727242/},
  note = {Source identifier: 5727242}
}