WOLFRAM MATERIALS for the ARTICLE:
Xin Jin and Pengfei Zhang (2022), Birkhoff normal form and twist coefficients of periodic orbits of billiards, Nonlinearity 35 3907 https://doi.org/10.1088/1361-6544/ac7701 Full article in PDF
Xin Jin and Pengfei Zhang (2022),
Birkhoff normal form and twist coefficients of periodic orbits of billiards,
Nonlinearity 35 3907
https://doi.org/10.1088/1361-6544/ac7701
Full article in PDF
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