@misc{indiciaed5b1187cc46e,
  title = {Age differences in fluid and crystallized intelligence.},
  author = {J L Horn and R B Cattell},
  year = {1967},
  doi = {10.1016/0001-6918(67)90011-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/6037305/},
  note = {Source identifier: 6037305}
}