%0 Journal Article %A B. A. Iskenderov %A A. I. Mekhtieva %T Radiation principles for the Helmholtz equation in a multidimensional layer with impedance boundary conditions %J Differencialʹnye uravneniâ %D 1993 %P 1462-1464 %V 29 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1993_29_8_a24/ %G ru %F DE_1993_29_8_a24