%0 Journal Article %A B. I. Stepanov %T Variation of the generation channel in a four-level quantum generator %J Doklady Akademii Nauk %D 1966 %P 1294-1297 %V 168 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1966_168_6_a19/ %G ru %F DAN_1966_168_6_a19