@misc{indiciaed3bd13c089ac,
  title = {Cephalic index: a gestational age-dependent biometric parameter.},
  author = {D L Gray and G S Songster and C A Parvin and J P Crane},
  year = {1989},
  url = {https://pubmed.ncbi.nlm.nih.gov/2677864/},
  note = {Source identifier: 2677864}
}