@article{DAN_1986_291_3_a19,
     author = {P. V. Elyutin},
     title = {On the {Kolmogorov} entropy of the ``stadium'' billiard},
     journal = {Doklady Akademii Nauk},
     pages = {595--598},
     publisher = {mathdoc},
     volume = {291},
     number = {3},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_291_3_a19/}
}