%0 Journal Article %A V. V. Karachik %T On a nonclassical boundary value problem for the Helmholtz equation %J Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika %D 2014 %P 14-22 %V 6 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/VYURM_2014_6_3_a1/ %G ru %F VYURM_2014_6_3_a1