Open problems on billiards and geometric optics
M. Bialy, C. Fiorebe, A. Glutsyuk, M. Levi, A. Plakhov, S. Tabachnikov, Arnold Mathematical Journal 8 (2022) 411–422.
LibreCat: https://research-explorer.ista.ac.at/record/10706
DOI: 10.1007/s40598-022-00198-y
arXiv: 2110.10750