@article{TMF_1996_108_1_a4,
     author = {V. A. Burdov},
     title = {Some properties of stationary states of  two-level systems},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {69--78},
     publisher = {mathdoc},
     volume = {108},
     number = {1},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1996_108_1_a4/}
}