@misc{indiciaec3c34a734aed,
  title = {Quantitative dynamic pulmonary surfactant determinations with the pneumatic surfactometer.},
  author = {L J Greenfield and R C Duncan},
  year = {1968},
  url = {https://pubmed.ncbi.nlm.nih.gov/4872767/},
  note = {Source identifier: 4872767}
}