%0 Journal Article %A V. I. Belinicher %A S. G. Tikhodeev %T The Wyld diagram technique -- a classical limit of the Keldysh technique for nonequilibrium processes %J Doklady Akademii Nauk %D 1988 %P 326-328 %V 301 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1988_301_2_a16/ %G ru %F DAN_1988_301_2_a16