@misc{indiciaece8dd4267e21,
  title = {The A-V lecture kit.},
  author = {W R CHRISTENSEN and R S WARNER},
  year = {1957},
  doi = {10.1148/68.3.415},
  url = {https://pubmed.ncbi.nlm.nih.gov/13420402/},
  note = {Source identifier: 13420402}
}