@misc{indiciae5c3352ded381,
  title = {A schematic eye for the pigeon.},
  author = {J Marshall and J Mellerio and D A Palmer},
  year = {1973},
  doi = {10.1016/0042-6989(73)90242-3},
  url = {https://pubmed.ncbi.nlm.nih.gov/4771207/},
  note = {Source identifier: 4771207}
}