%0 Journal Article %A A. K. Urinov %A K. T. Karimov %T Nonlocal boundary value problems for a three-dimensional elliptic equation with singular coefficients in a semi-infinite parallelepiped %J Sibirskie èlektronnye matematičeskie izvestiâ %D 2020 %P 161-178 %V 17 %I mathdoc %U http://geodesic.mathdoc.fr/item/SEMR_2020_17_a81/ %G ru %F SEMR_2020_17_a81