@article{05632501,
title = {Time-dependent circular billiard.},
journal = {Mathematical Problems in Engineering},
volume = {2009},
year = {2009},
doi = {10.1155/2009/531024},
zbl = {1181.37053},
language = {en},
url = {http://dml.mathdoc.fr/item/05632501}
}
Howard, J.E. Time-dependent circular billiard.. Mathematical Problems in Engineering, Tome 2009 (2009) . doi : 10.1155/2009/531024. http://gdmltest.u-ga.fr/item/05632501/