@misc{indiciaed3ed77cefa4e,
  title = {Learning curves or lines?},
  author = {A Opfell},
  year = {1992},
  doi = {10.3928/0147-7447-19921101-05},
  url = {https://pubmed.ncbi.nlm.nih.gov/1461808/},
  note = {Source identifier: 1461808}
}