@article{RM_1996_51_4_a17,
     author = {Ya. B. Vorobets},
     title = {Ergodicity of billiards in polygons: explicit examples},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {756--757},
     year = {1996},
     volume = {51},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1996_51_4_a17/}
}