@misc{indiciae19a326f7ca70,
  title = {Codes and operations in picture matching.},
  author = {G K Humphrey and S J Lupker},
  year = {1993},
  doi = {10.1007/bf00419610},
  url = {https://pubmed.ncbi.nlm.nih.gov/8416042/},
  note = {Source identifier: 8416042}
}