@misc{indiciae4be9148547c4,
  title = {Illumination direction from texture shading.},
  author = {Jan J Koenderink and Andrea J van Doorn and Astrid M L Kappers and Susan F te Pas and Sylvia C Pont},
  year = {2003},
  doi = {10.1364/josaa.20.000987},
  url = {https://pubmed.ncbi.nlm.nih.gov/12801166/},
  note = {Source identifier: 12801166}
}