@misc{indiciae116af659f2d9,
  title = {Complexity lower bounds for polygonal billiards.},
  author = {S. Troubetzkoy},
  year = {1998},
  doi = {10.1063/1.166301},
  url = {https://pubmed.ncbi.nlm.nih.gov/12779725/},
  note = {Source identifier: 12779725}
}