%0 Journal Article %A D. R. Yafaev %T Nonstationary scattering theory for elliptic differential operators %J Zapiski Nauchnykh Seminarov POMI %D 1982 %P 285-300 %V 115 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1982_115_a23/ %G ru %F ZNSL_1982_115_a23