@article{SM_2015_206_10_a4,
     author = {V. V. Fokicheva},
     title = {A~topological classification of billiards in locally planar domains bounded by arcs of confocal quadrics},
     journal = {Sbornik. Mathematics},
     pages = {1463--1507},
     publisher = {mathdoc},
     volume = {206},
     number = {10},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2015_206_10_a4/}
}