@misc{indiciae613e66376483,
  title = {Impossible objects: a special type of visual illusion.},
  author = {L S PENROSE and R PENROSE},
  year = {1958},
  doi = {10.1111/j.2044-8295.1958.tb00634.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/13536303/},
  note = {Source identifier: 13536303}
}