@misc{indiciae4e42a5ea6bde,
  title = {Flight Flutter Testing of Rotary Wing Aircraft Using a Control System Oscillation Technique},
  author = {Yen, J. G. and Viswanathan, S. and Matthys, C. G.},
  year = {1976},
  url = {https://ntrs.nasa.gov/citations/19770014097},
  note = {Source identifier: 19770014097}
}