@misc{indiciae758e8865698d,
  title = {Problem solving and strategy production in mentally retarded persons.},
  author = {R P Ferretti},
  year = {1989},
  doi = {10.1016/0891-4222(89)90026-7},
  url = {https://pubmed.ncbi.nlm.nih.gov/2648504/},
  note = {Source identifier: 2648504}
}