@misc{indiciae222f8e6e7ea4,
  title = {A new speech training hearing aid.},
  author = {J C BALLANTYNE},
  year = {1957},
  doi = {10.3109/00016485709126893},
  url = {https://pubmed.ncbi.nlm.nih.gov/13478463/},
  note = {Source identifier: 13478463}
}