@article{FAA_1987_21_4_a16,
     author = {Yu. G. Safarov},
     title = {Asymptotics of the spectrum of a boundary-value problem with periodic billiard trajectories},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {88--90},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_4_a16/}
}