@article{22161,
      url = {http://library.usi.edu/record/180249},
      title = {Helicopter acoustics : proceedings of an International            Specialists Symposium sponsored by the American  Helicopter Society, Washington, D.C.; the U.S. Army  Research Office, Durham, North Carolina; and the Langley     Research Center, Hampton, Virginia, and held at Langley  Research Center, May 22-24, 1978.. International  Specialists Symposium on Helicopter Acoustics},
      publisher = {National Aeronautics and Space Administration,     Scientific and Technical Information Office ;},
      number = {22161},
      recid = {180249},
      pages = {2 pts. :},
      address = {[Washington] :},
      year = {1978},
}