@misc{indiciae70326fdc20ac,
  title = {Umbilical waveforms in twin pregnancy.},
  author = {W B Giles and B J Trudinger and C M Cook},
  year = {1985},
  doi = {10.1017/s0001566000004803},
  url = {https://pubmed.ncbi.nlm.nih.gov/3914168/},
  note = {Source identifier: 3914168}
}