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@misc{OAI:Continuous-Phase-Foliations-Create-Analytic-Caustic-Collars-September-24-2026,
  author = {{OpenAI}},
  title = {{Continuous Phase Foliations Create Analytic Caustic Collars}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/Continuous-Phase-Foliations-Create-Analytic-Caustic-Collars-September-24-2026/paper.pdf}{OAI:Continuous-Phase-Foliations-Create-Analytic-Caustic-Collars-September-24-2026}},
  year = {2026}
}

@misc{OAI:Rigidity-of-Smooth-Billiards-with-a-Continuous-Caustic-Collar-September-24-2026,
  author = {{OpenAI}},
  title = {{Rigidity of Smooth Billiards with a Continuous Caustic Collar}},
  howpublished = {OpenAI Math Release preprint
                  \href{https://github.com/openai/math/blob/main/preprints/Rigidity-of-Smooth-Billiards-with-a-Continuous-Caustic-Collar-September-24-2026/paper.pdf}{OAI:Rigidity-of-Smooth-Billiards-with-a-Continuous-Caustic-Collar-September-24-2026}},
  year = {2026}
}