@article{TMF_1987_72_2_a6,
     author = {A. N. Vasil'ev and M. A. Guzev},
     title = {Adiabatic formalism and semiclassical approximation for discrete levels},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {229--243},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1987_72_2_a6/}
}