@misc{indiciaeee82d4a9c440,
  title = {Method and system for measuring sound velocity},
  author = {Boegeman, Dwight E. and Lowenstein, Carl D. and Spiess, Fred N.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/20080008769},
  note = {Source identifier: 20080008769}
}