@misc{indiciae8dad06dd676c,
  title = {Analysis and correlation of SA349/2 helicopter vibration},
  author = {Heffernan, Ruth and Precetti, Dominique and Johnson, Wayne},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19910047413},
  note = {Source identifier: 19910047413}
}