@misc{indiciae4ca3b970fcf7,
  title = {An improved computational procedure for determining helicopter rotor blade natural modes},
  author = {Weller, W. H. and Mineck, R. E.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780023849},
  note = {Source identifier: 19780023849}
}