%0 Journal Article %A Nguyen Tang %T The nonequilibrium Green functions and their applications to nonequilibrium systems %J Doklady Akademii Nauk %D 1980 %P 1365-1367 %V 251 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1980_251_6_a19/ %G ru %F DAN_1980_251_6_a19