@misc{indiciae3eb8dada8626,
  title = {Rotorcraft blade/vortex interaction noise - Its generation, radiation, and control},
  author = {Preisser, J. S. and Brooks, T. F. and Martin, R. M.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910039717},
  note = {Source identifier: 19910039717}
}