@article{10_4064_aa134_4_2,
     author = {Jan Florek},
     title = {Billiard and diophantine approximation},
     journal = {Acta Arithmetica},
     pages = {317--327},
     publisher = {mathdoc},
     volume = {134},
     number = {4},
     year = {2008},
     doi = {10.4064/aa134-4-2},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa134-4-2/}
}