@misc{indiciae425a7e24240d,
  title = {Size discrimination in children facilitated by changes in task difficulty.},
  author = {R B May and D F MacPherson},
  year = {1971},
  doi = {10.1037/h0030959},
  url = {https://pubmed.ncbi.nlm.nih.gov/5091225/},
  note = {Source identifier: 5091225}
}