@misc{indiciaeb69d5085f574,
  title = {A space-variant differential operator for visual sensitivity.},
  author = {A L Stewart and R Pinkham},
  year = {1991},
  doi = {10.1007/bf00224704},
  url = {https://pubmed.ncbi.nlm.nih.gov/2049413/},
  note = {Source identifier: 2049413}
}