@article{SM_2020_211_11_a0,
     author = {G. V. Belozerov},
     title = {Topological classification of integrable geodesic billiards on quadrics in three-dimensional {Euclidean} space},
     journal = {Sbornik. Mathematics},
     pages = {1503--1538},
     year = {2020},
     volume = {211},
     number = {11},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2020_211_11_a0/}
}