@misc{indiciae87c33b9125e0,
  title = {A tri-modal directional transducer.},
  author = {John L Butler and Alexander L Butler and Joseph A Rice},
  year = {2004},
  doi = {10.1121/1.1639326},
  url = {https://pubmed.ncbi.nlm.nih.gov/15000178/},
  note = {Source identifier: 15000178}
}