%0 Journal Article %A R. S. Makin %A S. B. Shikhov %T Completeness of the system of eigenfunctions of the multigroup diffusion approximation of a conditional-critical problem with a homogeneous active zone and an arbitrary reflector %J Differencialʹnye uravneniâ %D 1987 %P 1812-1815 %V 23 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1987_23_10_a23/ %G ru %F DE_1987_23_10_a23