@misc{indiciae0082e9f6c418,
  title = {Orientation of test-object affects visibility throughout visual field.},
  author = {S Appelle},
  year = {1973},
  doi = {10.1097/00006324-197312000-00002},
  url = {https://pubmed.ncbi.nlm.nih.gov/4521879/},
  note = {Source identifier: 4521879}
}