@misc{indiciae43602a86e094,
  title = {Tympanometry for Eustachian tube evaluation.},
  author = {E R Harford},
  year = {1973},
  doi = {10.1001/archotol.1973.00780010021006},
  url = {https://pubmed.ncbi.nlm.nih.gov/4684901/},
  note = {Source identifier: 4684901}
}