@article{DAN_1966_166_2_a22,
     author = {Yu. A. Freiman and B. L. Timan},
     title = {Analysis of quasiclassic equations in the case of a two-level system without allowance for relaxation effects},
     journal = {Doklady Akademii Nauk},
     pages = {341--344},
     publisher = {mathdoc},
     volume = {166},
     number = {2},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_166_2_a22/}
}