@misc{indiciae2fd3b60b7f6a,
  title = {Programmed learning devices.},
  year = {1970},
  doi = {10.1016/s0001-2092(07)62390-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/5197274/},
  note = {Source identifier: 5197274}
}