@misc{indiciae71162f968200,
  title = {The lambda sign in twin pregnancies.},
  author = {W Sepulveda and N J Sebire and K H Nicolaides},
  year = {1996},
  doi = {10.1046/j.1469-0705.1997.08060429-2.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/9014287/},
  note = {Source identifier: 9014287}
}