@misc{indiciae393c6cbc734b,
  title = {Training in ultrasonics.},
  author = {J H Holmes},
  year = {1975},
  doi = {10.1002/jcu.1870030403},
  url = {https://pubmed.ncbi.nlm.nih.gov/829526/},
  note = {Source identifier: 829526}
}