@misc{indiciaeb2fa5d8e33d2,
  title = {Interlocking and collision in multiple pregnancies; two case reports.},
  author = {R O SWANN},
  year = {1957},
  doi = {10.1016/0002-9378(57)90406-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/13411061/},
  note = {Source identifier: 13411061}
}