@misc{indiciae3bb9b41ae2cd,
  title = {Vertical-plane pendulum absorbers for minimizing helicopter vibratory loads},
  author = {Amer, K. B. and Neff, J. R.},
  year = {1974},
  url = {https://ntrs.nasa.gov/citations/19740026397},
  note = {Source identifier: 19740026397}
}