@misc{indiciae6f51f3ce0c61,
  title = {Visual systems: pro and con.},
  author = {R S Craig},
  year = {1971},
  doi = {10.1177/003693307101600103},
  url = {https://pubmed.ncbi.nlm.nih.gov/4105156/},
  note = {Source identifier: 4105156}
}