@misc{indiciaed5b70291861e,
  title = {The adding of visual information to previously recorded video-tapes: a functioning system.},
  author = {J D Armstrong and R C Worsey},
  year = {1972},
  doi = {10.1080/14640747208400293},
  url = {https://pubmed.ncbi.nlm.nih.gov/5049939/},
  note = {Source identifier: 5049939}
}