%0 Journal Article %A D. K. Ozerov %A Yu. A. Surkov %T On the influence of thin layers on the leading phases of a direct wave %J Zapiski Nauchnykh Seminarov POMI %D 1999 %P 5-11 %V 253 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1999_253_a0/ %G ru %F ZNSL_1999_253_a0