@misc{indiciae172c63b4c3ec,
  title = {Psychophysically derived visual mechanisms in turtle. II--Spatial properties.},
  author = {D F Sisson and A M Granda},
  year = {1989},
  doi = {10.1016/0042-6989(89)90177-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2773328/},
  note = {Source identifier: 2773328}
}