@misc{indiciaec2f07976360f,
  title = {Electro-active device using radial electric field piezo-diaphragm for sonic applications},
  author = {Bryant, Robert G. and Fox, Robert L.},
  year = {2005},
  url = {https://ntrs.nasa.gov/citations/20080004516},
  note = {Source identifier: 20080004516}
}