Bar Billiards and Poncelet's Porism
Rendiconti del Seminario Matematico della Università di Padova, Tome 120 (2008), pp. 157-166 
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Mozgawa, Witold. Bar Billiards and Poncelet's Porism. Rendiconti del Seminario Matematico della Università di Padova, Tome 120 (2008), pp. 157-166. https://www.numdam.org/item/RSMUP_2008__120__157_0/

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