@misc{indiciae22dc36bb2901,
  title = {Twin-singleton differences in intelligence?},
  author = {D Posthuma and E J De Geus and N Bleichrodt and D I Boomsma},
  year = {2000},
  doi = {10.1375/136905200320565535},
  url = {https://pubmed.ncbi.nlm.nih.gov/10918620/},
  note = {Source identifier: 10918620}
}