Voir la notice de l'article provenant de la source Math-Net.Ru
@article{JMAG_2002_9_a8, author = {S. V. Naydenov and V. V. Yanovskii}, title = {Normal forms of billiards}, journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii}, pages = {663--685}, publisher = {mathdoc}, volume = {9}, year = {2002}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/JMAG_2002_9_a8/} }
S. V. Naydenov; V. V. Yanovskii. Normal forms of billiards. Žurnal matematičeskoj fiziki, analiza, geometrii, Tome 9 (2002), pp. 663-685. http://geodesic.mathdoc.fr/item/JMAG_2002_9_a8/