@article{PSMIR_1976___2_A1_0,
     author = {Boldrighini, Carlo and Keane, Michael and Marchetti, Federico},
     title = {Billiards in {Polygons}},
     journal = {Publications des s\'eminaires de math\'ematiques et informatique de Rennes},
     note = {talk:1},
     pages = {1--19},
     publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes},
     number = {2},
     year = {1976},
     language = {en},
     url = {http://www.numdam.org/item/PSMIR_1976___2_A1_0/}
}