Geodesic
On conditions of the dynamical equivalence of waves in multilayer elastic media
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 24, Tome 218 (1994), pp. 166-175 Cet article a éte moissonné depuis la source Math-Net.Ru

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Necessary and sufficient conditions of the dynamic equivalence of two waves propagating in an elastic $p$-layered medium and undergoing all kind of exchanges on the interfaces of the medium are proved. These conditions are represented in the form of identities in which powers of the reflection and refraction coefficients contained in formulas for intensities of these waves enter. Bibliography: 5 titles. 
@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/}
}
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N. S. Smirnova. On conditions of the dynamical equivalence of waves in multilayer elastic media. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 24, Tome 218 (1994), pp. 166-175. http://geodesic.mathdoc.fr/item/ZNSL_1994_218_a12/