@misc{indiciae0b1cce92e0ad,
  title = {[Image differentiation procedures in electron microscopy].},
  author = {W Hoppe and R Langer and J Frank and A Feltynowski},
  year = {1969},
  doi = {10.1007/bf00633921},
  url = {https://pubmed.ncbi.nlm.nih.gov/5360874/},
  note = {Source identifier: 5360874}
}