Geodesic
Investigation of low frequency normal waves in Biot layer surrounded by an elastic medium
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 38, Tome 369 (2009), pp. 110-126

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The porous Biot layer surrounded by two elastic half-plates is considered. For this medium, two dispersion equations are established. These dispersion equations correspond to symmetric and antisymmetric parts of the medium. The investigation of these equations is fulfilled in region of low frequencies. The imaginary roots of these equations in this region determine the low frequency normal waves. Bibl. – 6 titles. 
@article{ZNSL_2009_369_a5,
     author = {L. A. Molotkov},
     title = {Investigation of low frequency normal waves in {Biot} layer surrounded by an elastic medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {110--126},
     publisher = {mathdoc},
     volume = {369},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2009_369_a5/}
}
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L. A. Molotkov. Investigation of low frequency normal waves in Biot layer surrounded by an elastic medium. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 38, Tome 369 (2009), pp. 110-126. http://geodesic.mathdoc.fr/item/ZNSL_2009_369_a5/