%0 Journal Article %A V. I. Agoshkov %T An inverse problem in transport theory and properties of a reflection operator %J Differencialʹnye uravneniâ %D 1991 %P 1002-1006 %V 27 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_6_a11/ %G ru %F DE_1991_27_6_a11