%0 Journal Article %A V. A. Krasnikov %T On dynamic equations for the density operators in external fields %J Doklady Akademii Nauk %D 1978 %P 313-315 %V 242 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1978_242_2_a13/ %G ru %F DAN_1978_242_2_a13