@misc{indiciae8c9f6574a5b9,
  title = {A portable, simple sonomicrometer.},
  author = {Bishop, V. S. and Kardon, M. B. and Stegall, H. F. and Stone, H. L.},
  year = {1967},
  url = {https://ntrs.nasa.gov/citations/19670066060},
  note = {Source identifier: 19670066060}
}