@article{ND_2011_7_3_a5,
     author = {Eugene Gutkin},
     title = {Billiard dynamics: {A} survey with the emphasis on open problems},
     journal = {Russian journal of nonlinear dynamics},
     pages = {489--512},
     publisher = {mathdoc},
     volume = {7},
     number = {3},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2011_7_3_a5/}
}