@article{TMF_1982_53_1_a10,
     author = {N. N. Bogolyubov (Jr.) and Fam Le Kien and A. S. Shumovskii},
     title = {Dynamics of a~two-level system and estimate of the relaxation time},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {108--113},
     publisher = {mathdoc},
     volume = {53},
     number = {1},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1982_53_1_a10/}
}