%0 Journal Article %A N. U. Nazarov %A O. A. Ponomarev %T Quantum dynamics of~transitions in~two-level electron--phonon systems with strong interactions %J Teoretičeskaâ i matematičeskaâ fizika %D 1990 %P 89-101 %V 85 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1990_85_1_a8/ %G ru %F TMF_1990_85_1_a8