@misc{indiciae81750be26c50,
  title = {Surface tension lowering substance in Eustachian tube function.},
  author = {W E Hagan},
  year = {1977},
  doi = {10.1288/00005537-197707000-00001},
  url = {https://pubmed.ncbi.nlm.nih.gov/577587/},
  note = {Source identifier: 577587}
}