@misc{indiciae9f4a2d40c07c,
  title = {Developmental study of performance on conceptual problems involving a rule shift.},
  author = {D E Guy},
  year = {1969},
  doi = {10.1037/h0028263},
  url = {https://pubmed.ncbi.nlm.nih.gov/5393030/},
  note = {Source identifier: 5393030}
}