@misc{indiciae2669ab7666bc,
  title = {Calibration force levels for bone conduction vibrators.},
  author = {B L Billings and M Winter},
  year = {1977},
  doi = {10.1044/jshr.2004.653},
  url = {https://pubmed.ncbi.nlm.nih.gov/604679/},
  note = {Source identifier: 604679}
}