@misc{indiciaed6ec7e37a1f3,
  title = {Sampling problems in twin research.},
  author = {S Torgersen},
  year = {1987},
  doi = {10.1016/0022-3956(87)90085-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/3440954/},
  note = {Source identifier: 3440954}
}