@misc{indiciaecf031eb2d496,
  title = {The teaching machine.},
  author = {A D Spiegel},
  year = {1966},
  doi = {10.1080/00325481.1966.11695777},
  url = {https://pubmed.ncbi.nlm.nih.gov/5907419/},
  note = {Source identifier: 5907419}
}