@misc{indiciae5256cd6f1615,
  title = {XYY and intelligence.},
  author = {J P Leff and P D Scott},
  year = {1968},
  doi = {10.1016/s0140-6736(68)91281-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/4170935/},
  note = {Source identifier: 4170935}
}