%0 Journal Article %A A. S. Starkov %T Degeneration and resonance phenomena in the wave propagation problems %J Zapiski Nauchnykh Seminarov POMI %D 1981 %P 217-227 %V 104 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1981_104_a19/ %G ru %F ZNSL_1981_104_a19