%0 Journal Article %A V. M. Babich %T Mathematical theory of diffraction (a~survey of research carried out at the Laboratory of Mathematical Problems of Geophysics of the Leningrad Branch of the Institute of Mathematics) %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1986 %P 47-62 %V 175 %I mathdoc %U http://geodesic.mathdoc.fr/item/TM_1986_175_a2/ %G ru %F TM_1986_175_a2