@misc{indiciaec4bb08c00266,
  title = {Blade vortex interaction noise reduction techniques for a rotorcraft},
  author = {Charles, Bruce D. and Hassan, Ahmed A. and Tadghighi, Hormoz and JanakiRam, Ram D. and Sankar, Lakshmi N.},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/20080004847},
  note = {Source identifier: 20080004847}
}