The rotation number of some transformation related to billiards in an ellipse

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Journals and Serials / Studia Mathematica / All issues

Rafał Kołodziej Studia Mathematica 81 (1985), 293-302 DOI: 10.4064/sm-81-3-293-302