@misc{indiciaed91971604100,
  title = {Sonography as a routine obstetrical diagnostic procedure.},
  author = {K Scheer},
  year = {1977},
  doi = {10.1002/jcu.1870050212},
  url = {https://pubmed.ncbi.nlm.nih.gov/404324/},
  note = {Source identifier: 404324}
}