@misc{indiciaea16d0b5dbdbc,
  title = {[An electrically controlled learning equipment].},
  author = {H Walther and L Schüren and J Wenzel},
  year = {1974},
  url = {https://pubmed.ncbi.nlm.nih.gov/4463650/},
  note = {Source identifier: 4463650}
}