@article{DAN_1993_333_1_a5,
     author = {M. B. Tabanov},
     title = {A billiard in an ellipse, geodesics on an ellipsoid and new},
     journal = {Doklady Akademii Nauk},
     pages = {19--22},
     publisher = {mathdoc},
     volume = {333},
     number = {1},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_1_a5/}
}