%0 Journal Article %A A. P. Kachalov %T Space-time ray method for waves of small deformation in a~nonlinear elastic medium %J Zapiski Nauchnykh Seminarov POMI %D 1984 %P 61-72 %V 140 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1984_140_a5/ %G ru %F ZNSL_1984_140_a5