@misc{indiciaece79ebcc40ee,
  title = {Impossible shadows and the shadow correspondence problem.},
  author = {Pascal Mamassian},
  year = {2004},
  doi = {10.1068/p5280},
  url = {https://pubmed.ncbi.nlm.nih.gov/15693671/},
  note = {Source identifier: 15693671}
}