%0 Journal Article %A V. N. Zav'yalov %T Billiard with slipping by an arbitrary rational angle %J Sbornik. Mathematics %D 2023 %P 1191-1211 %V 214 %N 9 %U http://geodesic.mathdoc.fr/item/SM_2023_214_9_a0/ %G en %F SM_2023_214_9_a0