@misc{indiciaef0e4ef101a33,
  title = {[Ring focusing collimators for scanning].},
  author = {E A Ispenkov and V I Kudin and A M Liutsko and L D Soshin},
  year = {1967},
  url = {https://pubmed.ncbi.nlm.nih.gov/5621328/},
  note = {Source identifier: 5621328}
}