@article{FAA_1978_12_3_a12,
     author = {S. A. Vugal'ter},
     title = {Discrete spectrum of multifrequency quantum systems possessing no stable subsystems},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {74--75},
     publisher = {mathdoc},
     volume = {12},
     number = {3},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1978_12_3_a12/}
}