%0 Journal Article %A V. N. Pervushin %T Method of functional integration and an~eikonal approximation for potential scattering amplitudes %J Teoretičeskaâ i matematičeskaâ fizika %D 1970 %P 22-32 %V 4 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_1970_4_1_a4/ %G ru %F TMF_1970_4_1_a4