Geodesic
Interference slow wave in poroacoustic Biot's layer
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 28, Tome 257 (1999), pp. 137-148

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It was shown that in the poroacoustical layer Biot is placed inside elastic medium for any parameters of the model there is the interference slow wave. For low frequencies wave has vary weak attenuation and the polarization coincids with the layer direction. It points to the possibility of mapping subtle trap inside the elastic medium during the crosshole measurements. 
@article{ZNSL_1999_257_a8,
     author = {P. V. Krauklis and L. A. Krauklis},
     title = {Interference slow wave in poroacoustic {Biot's} layer},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {257},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_257_a8/}
}
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P. V. Krauklis; L. A. Krauklis. Interference slow wave in poroacoustic Biot's layer. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 28, Tome 257 (1999), pp. 137-148. http://geodesic.mathdoc.fr/item/ZNSL_1999_257_a8/