%0 Journal Article %A V. S. Buldyrev %A A. I. Lanin %T On the limits of application of the acymptotic formula for the wave spreading along a~concave surface %J Zapiski Nauchnykh Seminarov POMI %D 1973 %P 52-71 %V 34 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1973_34_a3/ %G ru %F ZNSL_1973_34_a3