@misc{indiciaee233df0c6c61,
  title = {Multiple pregnancy. 2.},
  author = {K Benirschke and C K Kim},
  year = {1973},
  doi = {10.1056/nejm197306212882505},
  url = {https://pubmed.ncbi.nlm.nih.gov/4267537/},
  note = {Source identifier: 4267537}
}