Geodesic
Sources of the center of dilatation and center of compression types in the Biot model
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 196-213

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For a homogeneous isotropic model of porous Biot media, wave fields of spherically symmetric point sources are determined. The conditions under which a point source of the center of compression type can be replaced by two sources, one of which is a pair of oppositely directed forces and the other is a center of radially directed tangential forces, are obtained. Bibl. 9 titles. 
@article{ZNSL_1995_230_a14,
     author = {L. A. Molotkov and A. V. Bakulin},
     title = {Sources of the center of dilatation and center of compression types in the {Biot} model},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {196--213},
     publisher = {mathdoc},
     volume = {230},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a14/}
}
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L. A. Molotkov; A. V. Bakulin. Sources of the center of dilatation and center of compression types in the Biot model. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 25, Tome 230 (1995), pp. 196-213. http://geodesic.mathdoc.fr/item/ZNSL_1995_230_a14/