@misc{indiciae559393bc440d,
  title = {Teaching aids at low cost.},
  author = {R Lunnon and F S King},
  year = {1986},
  doi = {10.3109/17453058609156040},
  url = {https://pubmed.ncbi.nlm.nih.gov/2433326/},
  note = {Source identifier: 2433326}
}