%0 Journal Article %A N. E. Ershov %A S. I. Smagin %T Solution of three-dimensional stationary problems of diffraction %J Doklady Akademii Nauk %D 1990 %P 339-342 %V 311 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1990_311_2_a17/ %G ru %F DAN_1990_311_2_a17