@article{SIGMA_2005_1_a13,
     author = {Valery Kokshenev},
     title = {On {Chaotic} {Dynamics} in {Rational} {Polygonal} {Billiards}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2005},
     volume = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2005_1_a13/}
}