@article{DAN_1966_168_6_a19,
     author = {B. I. Stepanov},
     title = {Variation of the generation channel in a four-level quantum generator},
     journal = {Doklady Akademii Nauk},
     pages = {1294--1297},
     publisher = {mathdoc},
     volume = {168},
     number = {6},
     year = {1966},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1966_168_6_a19/}
}