@misc{indiciaec8e8d708d7f4,
  title = {[Experience with photo-subtraction using a mechanical subtration method].},
  author = {K Rittmeyer and J Freyschmidt},
  year = {1972},
  url = {https://pubmed.ncbi.nlm.nih.gov/4343396/},
  note = {Source identifier: 4343396}
}