%0 Journal Article %A V. M. Babich %T A complex ray application to calculation of the scalar “non-geometrical” waves %J Zapiski Nauchnykh Seminarov POMI %D 1990 %P 20-32 %V 186 %U http://geodesic.mathdoc.fr/item/ZNSL_1990_186_a2/ %G ru %F ZNSL_1990_186_a2