@misc{indiciae640010c38f09,
  title = {Chaos in a parametrically damped pendulum.},
  author = {HJ Smith and JA Blackburn},
  year = {1989},
  doi = {10.1103/physreva.40.4708},
  url = {https://pubmed.ncbi.nlm.nih.gov/9902718/},
  note = {Source identifier: 9902718}
}