@misc{indiciaedbc05a65cefe,
  title = {Acoustic device and method for measuring gas densities},
  author = {Shakkottai, Parthasarathy and Kwack, Eug Y. and Back, Lloyd},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19930004233},
  note = {Source identifier: 19930004233}
}