@misc{indiciaec98aa2311fc3,
  title = {Normal tympanometric gradient: a comparison of three methods.},
  author = {R de Jonge},
  year = {1986},
  doi = {10.3109/00206098609078394},
  url = {https://pubmed.ncbi.nlm.nih.gov/3566637/},
  note = {Source identifier: 3566637}
}