@misc{indiciaed1e4cf60f682,
  title = {Two Mathematical Models of Nonlinear Vibrations},
  author = {Brugarolas, Paul and Bayard, David and Spanos, John and Breckenridge, William},
  year = {2007},
  url = {https://ntrs.nasa.gov/citations/20100011238},
  note = {Source identifier: 20100011238}
}