@misc{indiciaef13e258b7ffd,
  title = {K-Electron Ionization by Direct Impact of Cathode Rays.},
  author = {D L Webster},
  year = {1928},
  doi = {10.1073/pnas.14.4.339},
  url = {https://pubmed.ncbi.nlm.nih.gov/16587345/},
  note = {Source identifier: 16587345}
}