@misc{indiciaea397054cbe2a,
  title = {Shape information from shading: a theory about human perception.},
  author = {A Pentland},
  year = {1989},
  doi = {10.1163/156856889x00103},
  url = {https://pubmed.ncbi.nlm.nih.gov/2487162/},
  note = {Source identifier: 2487162}
}