@misc{indiciae40be974e772c,
  title = {Minimal beam exposure with a field emission source.},
  author = {M Ohtsuki and E Zeitler},
  year = {1975},
  doi = {10.1016/s0304-3991(75)80021-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/1236030/},
  note = {Source identifier: 1236030}
}