@misc{indiciae845fc6401367,
  title = {A removable ultrasonic collimator for improving resolution.},
  author = {E Yeh},
  year = {1975},
  doi = {10.1002/jcu.1870030112},
  url = {https://pubmed.ncbi.nlm.nih.gov/803988/},
  note = {Source identifier: 803988}
}