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. http://www.numdam.org/item/RSMUP_2008__120__157_0/

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[2] W. Cieślak - A. Miernowski - W. Mozgawa, Isoptics of a closed strictly convex curve, Global differential geometry and global analysis, Proc. Conf., Berlin/Ger. 1990, Lect. Notes Math., 1481 (1991), pp. 28-35. | MR | Zbl

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