@misc{indiciae76caf1398c19,
  title = {Fermi acceleration on the annular billiard.},
  author = {R Egydio de Carvalho and F Caetano Souza and Edson D Leonel},
  year = {2006},
  doi = {10.1103/physreve.73.066229},
  url = {https://pubmed.ncbi.nlm.nih.gov/16906968/},
  note = {Source identifier: 16906968}
}