@misc{indiciae20ef61a1ed2b,
  title = {The Secondary Electrons Produced by Hard X-Rays in Light Elements.},
  author = {H Fricke and O Glasser},
  year = {1924},
  doi = {10.1073/pnas.10.11.441},
  url = {https://pubmed.ncbi.nlm.nih.gov/16586946/},
  note = {Source identifier: 16586946}
}