@misc{indiciae600088a67305,
  title = {Some mechanical aids to instruction.},
  author = {R OLLERENSHAW and P HANSELL},
  year = {1950},
  doi = {10.1136/bmj.2.4677.488},
  url = {https://pubmed.ncbi.nlm.nih.gov/15434428/},
  note = {Source identifier: 15434428}
}