Geodesic
The effective model of the layered medium in which porous and elastic layers being in slide contact alternate
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 30, Tome 275 (2001), pp. 165-186

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For the medium in which porous and elastic layers alternate with each other and there is slide contact on the interfaces, the effective model is established. This model is three-phase and contains two elastic phases and one fluid phase. The peculiarities of this effective model are that in it two waves with “triangular fronts” propagate and second (slow) longitudinal wave is absent. In partial case when thickness of elastic layers is very small but they remain as barries for fluid particles from the porous layers, the effective model becomes two-phase and one of “triangular fronts” disappears. 
@article{ZNSL_2001_275_a12,
     author = {L. A. Molotkov},
     title = {The effective model of the layered medium in which porous and elastic layers being in slide contact alternate},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {165--186},
     publisher = {mathdoc},
     volume = {275},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2001_275_a12/}
}
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L. A. Molotkov. The effective model of the layered medium in which porous and elastic layers being in slide contact alternate. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 30, Tome 275 (2001), pp. 165-186. http://geodesic.mathdoc.fr/item/ZNSL_2001_275_a12/