no. 2
Billiards in Polygons
Publications des séminaires de mathématiques et informatique de Rennes, no. 2 (1976), Exposé no. 1, 19 p. 
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     title = {Billiards in {Polygons}},
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     number = {2},
     year = {1976},
     language = {en},
     url = {http://archive.numdam.org/item/PSMIR_1976___2_A1_0/}
}
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Boldrighini, Carlo; Keane, Michael; Marchetti, Federico. Billiards in Polygons. Publications des séminaires de mathématiques et informatique de Rennes, no. 2 (1976), Exposé no. 1, 19 p. http://archive.numdam.org/item/PSMIR_1976___2_A1_0/

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