%0 Journal Article %A V. F. Los' %T Superoperator method in the theory of an oscillator which interacts weakly with a medium. I. General results %J Teoretičeskaâ i matematičeskaâ fizika %D 1978 %P 113-126 %V 35 %N 1 %U http://geodesic.mathdoc.fr/item/TMF_1978_35_1_a11/ %G ru %F TMF_1978_35_1_a11