@misc{indiciae102ece51bdef,
  title = {Multiperiodic orbits in a pendulum with a vertically oscillating pivot.},
  author = {HJ Smith and JA Blackburn},
  year = {1994},
  doi = {10.1103/physreve.50.539},
  url = {https://pubmed.ncbi.nlm.nih.gov/9961999/},
  note = {Source identifier: 9961999}
}