@misc{indiciae1b85171003a8,
  title = {Multiple pregnancy. 1.},
  author = {K Benirschke and C K Kim},
  year = {1973},
  doi = {10.1056/nejm197306142882406},
  url = {https://pubmed.ncbi.nlm.nih.gov/4574107/},
  note = {Source identifier: 4574107}
}