@misc{indiciae41c0901aff02,
  title = {Birth order, family size, and intelligence.},
  author = {L Belmont and F A Marolla},
  year = {1973},
  doi = {10.1126/science.182.4117.1096},
  url = {https://pubmed.ncbi.nlm.nih.gov/4750607/},
  note = {Source identifier: 4750607}
}