%0 Journal Article %A Yu. V. Gandel' %A I. K. Lifanov %A T. S. Polyanskaya %T On a justification of the method of discrete singularities in two-dimensional diffraction problems %J Differencialʹnye uravneniâ %D 1995 %P 1536-1541 %V 31 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1995_31_9_a13/ %G ru %F DE_1995_31_9_a13