%0 Journal Article %A V. A. Sharafutdinov %T Quasi-isotropic approximation in dynamic elasticity, and some %J Doklady Akademii Nauk %D 1993 %P 723-725 %V 329 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1993_329_6_a9/ %G ru %F DAN_1993_329_6_a9