@article{bwmeta1.element.bwnjournal-article-smv81i1p25bwm,
author = {Rafa\l\ Ko\l odziej},
title = {The rotation number of some transformation related to billiards in an ellipse},
journal = {Studia Mathematica},
volume = {81},
year = {1985},
pages = {293-302},
zbl = {0589.28011},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv81i1p25bwm}
}
Kołodziej, Rafał. The rotation number of some transformation related to billiards in an ellipse. Studia Mathematica, Tome 81 (1985) pp. 293-302. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv81i1p25bwm/