@misc{indiciae97290a8ccfb4,
  title = {Nonlinear coupled rotor-fuselage helicopter vibration studies with higher harmonic control},
  author = {Friedmann, P. P. and Venkatesan, C. and Papavassiliou, I.},
  year = {1990},
  url = {https://ntrs.nasa.gov/citations/19910032607},
  note = {Source identifier: 19910032607}
}