@misc{indiciae0e81ef60c2e3,
  title = {Aperiodic behaviour of a non-linear oscillator.},
  author = {Baker, N. H. and Moore, D. W. and Spiegel, E. A.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720030792},
  note = {Source identifier: 19720030792}
}