@article{TRSPY_2016_295_a1,
     author = {M. Bialy and A. E. Mironov},
     title = {On fourth-degree polynomial integrals of the {Birkhoff} billiard},
     journal = {Informatics and Automation},
     pages = {34--40},
     publisher = {mathdoc},
     volume = {295},
     year = {2016},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2016_295_a1/}
}