%0 Journal Article %A V. I. Ivanov %T Calculation of corrections to the Fock's asymptotic formula for the wave field in a~neighbourhood of surfaces of %J Zapiski Nauchnykh Seminarov POMI %D 1981 %P 102-110 %V 104 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a9/ %G ru %F ZNSL_1981_104_a9