@article{SM_2023_214_9_a0,
     author = {V. N. Zav'yalov},
     title = {Billiard with slipping by an arbitrary rational angle},
     journal = {Sbornik. Mathematics},
     pages = {1191--1211},
     publisher = {mathdoc},
     volume = {214},
     number = {9},
     year = {2023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2023_214_9_a0/}
}