@misc{indiciaeae691644bac9,
  title = {Normal (?) pulmonary valvular gradient..},
  author = {W H Herbert and C Emirgil and B J Sobol},
  year = {1972},
  url = {https://pubmed.ncbi.nlm.nih.gov/4505332/},
  note = {Source identifier: 4505332}
}