@article{ZNSL_1994_218_a12,
     author = {N. S. Smirnova},
     title = {On conditions of the dynamical equivalence of waves in multilayer elastic media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {166--175},
     year = {1994},
     volume = {218},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1994_218_a12/}
}