@misc{indiciae31f1cfdf31c0,
  title = {Distinguishing two classes of impossible objects.},
  author = {E B Thro},
  year = {1983},
  doi = {10.1068/p120733},
  url = {https://pubmed.ncbi.nlm.nih.gov/6678416/},
  note = {Source identifier: 6678416}
}