Geodesic
The effective model of a stratified solid-fluid medium as a special case of the Biot model
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 172-195 
L. A. Molotkov; A. V. Bakulin. The effective model of a stratified solid-fluid medium as a special case of the Biot model. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 172-195. http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a13/
@article{ZNSL_1995_230_a13,
     author = {L. A. Molotkov and A. V. Bakulin},
     title = {The effective model of a~stratified solid-fluid medium as a~special case of the {Biot} model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {172--195},
     year = {1995},
     volume = {230},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a13/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The Biot model is compared with the effective model of a stratified periodic elastic-fluid medium, and the parameters of the transversally isotropic Biot model that turn it into the effective model are found. In the course of this comparison, some intermediate models, which are generalizations of the effective model and particular cases of the Biot model, are considered. For all of the models, the wave fronts excited by a point source are determined. The distinguishing feature of wave fronts in the intermediate models is the occurrence of double loops on some of them. Bibl. 15 titles.